C. the ability to screen ultraviolet light was not necessary in order for plants to colonize land.
Although it is undoubtedly beneficial for shielding the plant from damaging UV rays, it is not necessary for a successful colonization. More crucial for plants to survive in a terrestrial environment were other adaptations including vascular tissue for transporting water throughout the plant, a waxy cuticle to prevent water loss, and the development of strong spore walls to guard the spore from dehydration. To colonize the land the plant need system to acquire water and nutrient given by roots, and way to reduce water losses, also prevention against high intensity sunlight.
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What is the total number of chromosomes in a normal human zygote?
In a normal human zygote they contain 46 chromosomes and are in 23 pairs.
Answer:
46
one diploid is 23, so a pair(2) diploid which is one haploid has 46
some bats prey on certain moths, hunting them using echolocation. some of those moths have evolved ears sensitive to the sound frequencies bats use to locate them, helping them to avoid being caught. the bats, in turn, have evolved to change the frequency they use. this interaction is an example of .
This scenario's description of the relationship between bats and moths is an illustration of coevolution. Coevolution is the process by which the evolution of two or more species is mutually influenced.
Exactly how do bats find moths and other prey?Bats navigate by using echolocation to find food insects. They produce ultrasonography, or sound waves above the audible range. Bats create sound waves, which are reflected by objects in their habitat.
What one evolutionary strategy has been used by moths to prevent being eaten by bats?Moths created an early warning system to protect themselves from the new method of attack by bats. Moths can detect bat echolocation, perform evasive flight manoeuvres, and avoid being devoured because of their adapted ears.
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you observe the formation of horns in two different insect groups. how would you go about determining whether these horns are a homology or analogy?
By evaluating the structural features and ascertain the origin and evolutionary history of the horns in order to decide whether the horns in two different insect families are a homology or analogy.
Homology describes a structural similarity between two or more species that is attributable to a shared ancestor. If the horns in the two insect groups are homologous, they will have a common ancestral structure and have similar structural and developmental origins.
An analogy is a structural similarity between two or more species that isn't attributable to convergent evolution but rather to a shared ancestor. In other words, despite similar environmental stresses, the structures developed separately.
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What is present in plant cells only?
There are a number of organelles that are exclusively or mostly found in plant cells. The organelles in which photosynthesis occurs are called chloroplasts. Green pigment chlorophyll, which is present in chloroplasts, enables them to absorb light energy and transform it into chemical energy.
Cell wall- The hard cell wall that surrounds plant cells is constructed from cellulose, hemicellulose, and other polysaccharides.
Huge central vacuole- The majority of the space inside plant cells is taken up by a large central vacuole. Water, nutrients, and waste materials are present in the vacuole, which also contributes to the regulation of the internal environment of the cell.
The interchange of tiny molecules like ions and carbohydrates between neighboring plant cells is made possible by a structure called a plasmodesmata, which connects the cells.
Starch grains- Plant cells frequently store extra glucose in starch grains, which may be digested when needed to provide energy.
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what a molecular process found only in retroviruses?
Only simple retroviruses, not complex retroviruses, have been found to transmit cellular genes. It is unclear why these two viruses differ, but it may have something to do with how retroviruses acquire cellular sequences or how the viral genome is organised, which must be tolerant of foreign insertion.
Retroviruses carry changed cellular genes that give the virus a high level of tumorigenicity. The growth-regulatory genes in these viral or v-onc genes are typically altered. Protooncogenes or c-onc genes are the names given to their cellular progenitors (Bishop 1983, Varmus 1984, Cooper 1990). Gain of function of a positive growth signal is caused by over expression or incorrect expression, which is frequently paired with mutation of an oncogene that has integrated into a viral genome.
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5. The map below shows the typical breeding ranges for six different populations of juncos. The UCSD juncos population is not shown on this map. If you wanted to look for evidence of whether juncos from one of these six populations ever interbred with juncos from one of the other of the six populations, in what parts of the map do you think you would be more likely to observe such behavior? Mark those locations on the map with small stars.
HEEELPPP ASAAPPP
Juncos interbred in the forest of northern rocky mountains and from southern Alberta to eastern Idaho.
What are Juncos?A species of junco, or small, greyish New World sparrows, includes the dark-eyed junco.
A large portion of temperate North America is home to this bird, which is also widespread in the Arctic throughout the summer. Similar to the closely related fox sparrow, it is a very variable species, and its systematics are still not fully understood.
Juncos interbred in the forest of northern rocky mountains and from southern Alberta to eastern Idaho.
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Fluid mosaic model of membrane structure
Which of the following is true of the fluid mosaic model of membrane structure?
A)Membranes behave more like a solid than a liquid.
B)Lipids can flip from one leaflet to another as easily as they can move laterally in a membrane.
C)Proteins can easily move across membranes.
D)Proteins can easily move laterally through membranes.
D) Proteins can easily move laterally through membranes, is the following true of the fluid mosaic model of membrane structure.
Fluid mosaic model of plasma membrane structure is bilipid layer and flexible.
This model was given by Singer and Nicholson, according to which lipids have molecules in the middle and the protein may be intrinsic or extrinsic.
also, considered to be a quasi fluid structure.
lipids which form the structure are phosphoglycerate, sphingolipids and cholesterol.
There are 2 types proteins in plasma membrane - integral and peripheral proteins.
carbohydrates are of 2 types - glycolipids and glycoproteins.
The role includes, interaction of cell with the environment.
sorting membrane protein to several compartments.
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can you interpret the results of mating experiments in fruit fly populations? researcher diane dodd divided a laboratory population of fruit flies and then raised some flies on a starch medium and others on a maltose medium. after one year (about 40 generations), populations raised on starch digested starch more efficiently, while those raised on maltose digested maltose more efficiently, indicating the flies had adapted to better use the nutrients present in their environments. dodd then put flies from the same or differently adapted populations in mating cages and measured mating frequencies. she also performed control experiments. interpret the results of her experiments, shown below, to answer the questions.
Mating preferences are complex and can be influenced by many factors. Dodd's experiments provide a useful starting point for investigating the role of adaptation in reproductive isolation and speciation.
Diane Dodd's experiments with fruit fly populations involved dividing the population and raising them on different diets for 40 generations. The populations adapted to their respective diets, becoming more efficient at digesting the specific nutrients provided by their food source
Dodd then put flies from the same or differently adapted populations in mating cages and measured mating frequencies. By doing so, she could test whether the adaptation to different diets had any effect on mating preferences and behavior. She also performed control experiments to ensure that any differences observed were not due to random factors.
The results of Dodd's experiments are not provided in the question, so it is difficult to provide a detailed interpretation without them. However, in general, if flies from the same adapted population mated more frequently than those from differently adapted populations, it would suggest that the adaptation to different diets has led to reproductive isolation between the populations. This could be a sign of incipient speciation, where the two populations are becoming genetically distinct and may eventually form separate species.
On the other hand, if there were no significant differences in mating frequencies between the populations, it would suggest that the adaptation to different diets has not led to reproductive isolation. This could be because the genetic differences between the populations are not yet large enough to prevent interbreeding or because there are other factors that are more important in determining mating preferences, such as visual or olfactory cues.
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you perform a flagella stain on a bacteria and find that it does not produce flagella. however, when you observe a motility medium result for this organism, it is positive. what is a possible explanation for this discrepancy?
One possible explanation for this discrepancy is that the organism may be using a different mechanism for motility other than flagella.
While flagella are a common mechanism for bacterial motility, some bacteria are capable of moving without flagella. These mechanisms include gliding motility, twitching motility, and swarming motility, among others.
Gliding motility is a type of movement that involves the use of specialized structures on the bacterial surface that allow the cell to glide over surfaces. Twitching motility involves the extension and retraction of pili, which are hair-like structures on the surface of the cell. Swarming motility is a type of movement that involves the coordinated movement of bacterial cells across a surface.
In the case of the organism that does not produce flagella but shows motility on a motility medium, it is possible that it is using one of these alternative mechanisms for motility. Therefore, while the flagella stain did not show any flagella, the organism was still capable of moving due to the presence of other motility mechanisms.
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why would a scientist want to know the sequence of a dna molecule
Knowing the sequence of a DNA molecule is important for several reasons such as studying evolution, forensic analysis, diagnosing diseases, etc.
Here are a few:
Understanding genetic information: DNA sequence provides information about the genetic makeup of an organism, including the sequence of genes, their location, and their function. By analyzing DNA sequences, scientists can gain insights into the genetic basis of traits and diseases.Studying evolution: DNA sequence can be used to trace the evolutionary history of organisms. By comparing the DNA sequences of different species, scientists can determine how closely related they are and how they evolved over time.Diagnosing diseases: Many diseases are caused by genetic mutations. By analyzing the DNA sequence of a patient, scientists can identify specific mutations that may be responsible for a particular disease.Developing treatments: By understanding the DNA sequence of a disease-causing organism, scientists can develop targeted therapies that specifically target the genetic mutations responsible for the disease.Forensic analysis: DNA sequence can be used in forensic investigations to identify suspects, determine the source of biological samples, and establish family relationships.To learn more about DNA, refer:-
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increased sympathetic stimulation causes vasodilation, bringing elevated blood pressure back to normal.true or false
False, according to the statement. Vasoconstriction is a result of increased sympathetic activation; this raises blood pressure.
Vasoconstriction—the narrowing of blood vessels—can be brought on by sympathetic activation of blood vessels. The release of hormones that induce the smooth muscles of the blood arteries to contract, including adrenaline and norepinephrine, may be the reason for this. Consequently, the blood supply to some parts of the body is reduced and blood pressure rises. A number of medical illnesses can be treated with sympathetic stimulation, including respiratory disorders, some mental health conditions, bladder and intestinal disorders, pain management, and heart conditions such arrhythmias or irregular heart rhythms. It is also used to assist regulate breathing, increase energy, lower anxiety, and improve performance.
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Question based on microbiology in the attachment
In the diagram below, the place where the concentration of oxygen and carbon dioxide are highest outside the cell and inside the cell respectively.
2. Where the concentration of oxygen and carbon dioxide are lowest are highest inside the cell and outside the cell respectively.
3. The movement of the different substances is shown in the attached diagram.
What is diffusion?The net movement of anything, typically from a place of higher concentration to a region of lower concentration, is known as diffusion.
In a given cell, the direction of movement of molecules is from regions of higher concentration to regions of lower concentration.
In a microbe, the concentration of oxygen is higher outside the cell and lower inside the cell. Hence, oxygen moves by diffusion into the cell.
Also, the concentration of carbon dioxide is lower outside the cell and higher inside the cell. Hence, carbon dioxide moves by diffusion out of the cell.
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what type of succession occurs in areas where there is no soil?
Ecological succession that starts in essentially lifeless environments, including areas without soil, is referred to as primary succession.
Natural communities gradually replace one another through a process called ecological succession.
Ecological succession can be divided into two main categories: primary succession and secondary succession.
When a fresh area of land is produced or first becomes exposed, primary succession occurs. Examples of when this occurs include when lava cools and forms new rocks or when a glacier retreats and reveals bare rocks. Organisms have to start over during primary succession. A few little plants that can survive without a lot of soil may first start to develop, followed by lichens that cling to rocks. They are referred to as "pioneer species."
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Humans introduced rabbits to Australian ecosystems when the animals arrived on boats with convicts shipped to the continent.
Why did the rabbit population become invasive and grow so quickly?
Responses
The rabbits had no food.
The rabbits had no food.
The ship brought thousands of rabbits.
The ship brought thousands of rabbits.
There were no natural predators.
There were no natural predators.
All of the rabbits were infected with disease.
All of the rabbits were infected with disease.
Answer: the third response
Explanation: no predators means that there is no balance in population
Answer: There were no natural predators.
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how is atp used in the digestion, respiration, and excretion processes in all cells?
Adenosine triphosphate(ATP), an energy-rich compound that absorbs the chemical energy harvested from the breakdown of simple sugars as well as releases it to fuel, is one goal of the deterioration of foodstuffs.
This compound transforms the energy enclosed in covalent bond into the compound. Consider ATP as the universal currency of your body's cells. Your body breaks down the food that eat into tiny macronutrient components. Your body converts all of the carbs in your diet to glucose, a simple sugar.Adenosine triphosphate(ATP), an energy-rich compound that absorbs the chemical energy harvested from the breakdown of simple sugars as well as releases it to fuel, is one goal of the deterioration of foodstuffs. A sequence of chemical processes known as cellular respiration convert glucose into ATP, which can then be used as energy for a variety of bodily functions.
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Dr. wagner is investigating a newly discovered, disease-causing agent. she determines that one structure in the agent is double-stranded rna. what kind of agent is dr. wagner studying?
If Dr. Wagner has discovered a disease-causing agent with double-stranded RNA, she is likely studying a virus in the Reoviridae family, or a similar group of viruses.
Reoviruses are a family of viruses that are known to have double-stranded RNA genomes. They are common pathogens in humans and animals, and can cause a variety of illnesses, including respiratory infections, gastroenteritis, and viral meningitis. There are also other viruses that can have double-stranded RNA genomes, such as the Birnaviridae family and the Totiviridae family, among others. However, the Reoviridae family is the most well-known and common group of viruses with double-stranded RNA genomes, and is therefore the most likely candidate for the agent that Dr. Wagner is studying. It's worth noting that not all viruses have double-stranded RNA genomes. Some viruses have single-stranded RNA, while others have DNA genomes. The type of genome a virus has can have important implications for how it replicates, infects cells, and causes disease.
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if the trees in that woodlot are associated with emf, what effect might the excess nitrate have on the fungi and/or trees?
If the trees in a woodlot are associated with EMF (ectomycorrhizal fungi), excess nitrate in the soil can have negative effects on both the fungi and the trees.
EMF are a type of fungi that form a mutualistic association with the roots of trees. They help the trees to absorb water and nutrients from the soil, and in turn, the fungi receive carbon compounds from the trees. Nitrate is a form of nitrogen that plants and fungi can use for growth. However, when nitrate levels in the soil are too high, it can disrupt the balance of nutrients and affect the EMF and trees in several ways.
Excess nitrate can reduce the availability of other essential nutrients, such as phosphorus, which can limit the growth of the EMF and trees. It can also disrupt the carbon-nitrogen balance between the trees and EMF, which can lead to a decline in the health of both. Additionally, high nitrate levels can lead to the production of harmful reactive nitrogen species, which can cause damage to the EMF and trees.
Overall, excess nitrate in the soil can have negative impacts on the symbiotic relationship between EMF and trees, which can ultimately affect the health and productivity of the woodlot ecosystem.
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why are fungi so important to the carbon cycle? view available hint(s)for part a why are fungi so important to the carbon cycle? fungi accelerate the carbon cycle by breaking down wood and thus freeing up carbon atoms. fungi produce o2 and make it available to nearby plants for use in the carbon cycle. fungi release water from the soil and break it up into its constituent elements, thus freeing up hydrogen atoms for the carbon cycle. fungi fix carbon and produce o2 just like plants do during photosynthesis.
Fungi are important to the carbon cycle because they help to break down and recycle organic matter, facilitate nutrient exchange between organisms, and increase carbon sequestration in the soil.
Fungi are crucial to the carbon cycle because they play a critical role in the decomposition of organic matter, including dead plants and animals. When fungi break down these materials, they release carbon dioxide (CO2) into the atmosphere, which can be used by plants for photosynthesis.
Fungi can break down complex organic compounds, such as lignin and cellulose, that are difficult for other organisms to digest. By doing so, they help to recycle nutrients and carbon back into the soil, where they can be taken up by living organisms.
In addition, some fungi form mutually beneficial relationships with plants, known as mycorrhizae, in which they exchange nutrients and other compounds. This can help plants to absorb more carbon and other nutrients from the soil, leading to increased plant growth and carbon sequestration.
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--The given question question is incorrect, the correct question is
"Why are fungi so important to the carbon cycle? fungi accelerate the carbon cycle by breaking down wood and thus freeing up carbon atoms. fungi produce o2 and make it available to nearby plants for use in the carbon cycle. fungi release water from the soil and break it up into its constituent elements, thus freeing up hydrogen atoms for the carbon cycle. fungi fix carbon and produce o2 just like plants do during photosynthesis."--
Members of which bacterial phylum share a unique morphology?A. spirochaetes
B. oxygenic photosynthesis
C. electronegative
D. ribosomal
A. Spirochaetes are the bacterial phylum that share a unique morphology.
Spirochaetes belong to a group of spiral-shaped bacteria, some of which are serious human pathogens, causing diseases such as syphilis, eating disorders, Lyme disease, and relapsing fever.
The phylum Spirochaetes comprises a large group of motile bacteria that are widely distributed in the environment and are common pathogens. Treatment is with antibiotics such as doxycycline and penicillin. Spirochetes are characterized by the helical shape of bacteria. Spirochetes (also called spirochetes) belong to a phylum of characteristic mesothelial (double-membrane) bacteria, most of which have long, spirally coiled (corkscrew-shaped) cells. Spirochetes are chemoheterotrophic organisms in nature, 5–250 μm in length and about 0.1–0.6 μm in diameter.
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The primary purpose of fruits is
A. attracting pollinators
B. providing nutrients to seeds
C. protecting the seeds from animals
D. protecting and dispersing the seeds
E. providing nutrients to animals
Fruits' main function is to preserve and spread their seeds.
Is fruit the main means of seed dispersal?Many plant species rely on their fruits to help spread their seeds. The seeds of dehiscent fruits, such as poppy capsules, are typically distributed from the fruits themselves, which may still be attached to the plant. The fruit and seeds are frequently transferred away from the parent plant together in fleshy or indehiscent fruits.
What is a primary function's name?The major component of a programme description is a self-contained set of statements that includes lines of code or several functions. The M-file is the name of the main function, which is where the programme description is described.
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which is true of the fluid mosaic model of membrane structure?
The model compares the membrane to a "mosaic" of several parts, including a fluid or elastic double layer made up of big protein molecules and lipid molecules. In a phospholipid bilayer, a protein is embedded.
Who is the fluid persona?Because they may be made to flow or move, liquids and gases are referred to as fluids. The molecules of any fluid are constantly moving randomly and colliding with one another as well as the walls of any container.
What would you use to define something as fluid?Fluid can be used to indicate something that is prone to change or instability. Travel there is dangerous because of the unstable political climate and the ongoing threat of a bloody revolt.
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What is the function of pits in xylem
Answer: The pit membrane, which lies in the center of each pit, allows water to pass between xylem conduits but limits the spread of embolism and vascular pathogens in the xylem.
Explanation:
Sorry if i'm wrong
How have plants adapted to different environmental stresses?
Answer: Plant adaptation to environmental stress - Plants are immobile organisms and so rely on their ability to adapt to the environment to survive. Plant responses to stresses like heat, high salinity, and drought involve a rapid, reversible process that modifies proteins called SUMO (small ubiquitin-like modifier).
Explanation:
True/False? the largest quantities of keratin are found in the epidermal layer called the Stratum
The answer is true. The Stratum Corneum is the epidermal layer with the highest percentage of keratinized cells. The epidermis' outermost layer, the stratum Corneum, serves to shield the interior layers from mechanical abrasion and desiccation.
The top layer of epidermis is the stratum corneum, which is composed of keratinized squames. This layer contains maximum amount of keratin in skin. These are layers of dead cells that have flattened into squames, or scale-like structures, and are loaded with tightly packed keratin. These flat, difficult-to-see cells are seen in histological sections. They will swell if submerged in sodium hydroxide, at which point stacks of 10–20 (or even 35) layers of cells arranged in hexagonal columns will be seen. This layer's squames on the surface flakes off (making up the main content of household dust).
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What type of epistasis between locus A and B could be explained by the following biochemical pathway?
type of epistasis between locus A and B is Single recessive epistasis.
Both genes A and B are dominant in this case and each can result in a unique phenotype. Recessive epistasis, a type of epistatic interaction, is visible in the twp. Even though the hypostatic gene is dominant, homozygous recessive alleles in the epistatic locus prevent its expression. Even though Locus B is "B", if Locus A is homozygous recessive (aa), then it cannot exhibit its phenotype since the precursor for the B gene to create the red pigment has not been produced in the absence of the dominant A locus. An epistatic recessive gene prevents the expression of another gene. It is single recessive epistasis because of this.
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the space between the parietal layer and visceral layer of the pericardium contains ______.
pericardial fluid
film of serous fluid
pericardial cavity
serous membranes
The fluid produced into the pericardial cavity by the pericardium's serous layer is known as pericardial fluid. An exterior fibrous layer and an inner serous layer make up the pericardium. Thus, option B is correct.
What is the space between the parietal layer in the heart?A clear to pale yellow liquid that is present throughout the body, especially in the spaces between organs and the membranes that surround or line them.
Such as the heart and pericardium or the abdomen and peritoneum, and that, when present in significant amounts, is a sign of a pathological condition.
A pericardial effusion's pressure may cause the heart's rhythm to change. In severe circumstances, it could result in mortality if left untreated and cause heart failure.
Therefore, the space between the parietal layer and visceral layer of the pericardium contains film of serous fluid.
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7. how do variations in the anatomical part affect contrast?
Variations in the anatomical part can affect contrast in several ways. As the part size increases, so does the number of attenuation increases, as well as the production of scatter radiation. This results in a loss of contrast.
X-ray is a quick medical procedure used to produce images of the insides of the body. Here are several ways that anatomical parts can affect the contrast in the pictures x-ray produce:
First, different tissues have different densities, which can affect how much x-ray radiation is absorbed and how much is transmitted through the body. This can result in differences in contrast between different parts of the body.
Second, the size and shape of the anatomical part can also affect contrast. Larger or thicker parts may absorb more radiation, resulting in less contrast, while smaller or thinner parts may absorb less radiation, resulting in greater contrast.
Finally, the presence of contrast agents, such as iodine or barium, can also affect contrast by increasing the absorption of x-ray radiation in certain areas of the body.
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What is the function of epidermal ridges?
According to some theories, finger pads' epidermal ridges drain excess water, avoid blistering, and encourage interlocking when they come into touch with rough surfaces. They also increase tactile sensitivity.
What are epidermal ridges formed?The epidermis conforms to the dermal papillae that lie beneath the epidermis to generate the epidermal ridges. As the dermal surface becomes uneven, the epidermis' basal cells contribute to the development of ridges. Ridges are formed by this process. Our fingerprints are anatomical features of the thick skin's epidermis called epidermal ridges. The skin's oil reacts with a surface when the epidermal ridges precisely come into touch with it, resulting in the fingerprint.
What distinguishes dermal papillae from epidermal ridges?Dermal connective tissue extends through the epidermal layer to form dermal papillae. The epidermis is carried over into dermal layer by rete ridges. The palms and hands' thick skin have an especially noticeable undulating pattern. The reticular and papillary dermis are difficult to distinguish from one another. Fingerprints develop in a developing fetus where the papillae of an underneath dermal layer (papillary layer), which is where the cells of a basal layer of the epidermis meet. This is where the ridges on the fingers that you associate with fingerprints develop.
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why are natural killer cells considered to be part of the innate immune response?
Natural Killer cells, however, are typically regarded as being part of the innate immune defense since they lack antigen-specific cell surface receptors.
In a phylogenetically old defense mechanism known for its potent cytolytic action against physiologically challenged cells including tumor cells and virus-infected cells, natural killer (NK) cells stand out. Their use in the treatment of hematological cancers may be superior to the well-known T lymphocyte-based immunotherapy in a number of ways.
An antigen-specific
An antigen is considered to have antigenic specificity when the host cells recognize it as a unique molecular entity and can accurately distinguish it from other antigens. The side-chain conformations of the antigen have a significant impact on antigen specificity.
Are antigens particular or general?
Certain immune responses are brought on by antigens. On the surfaces of infections, pathogen-specific antigens are generally present. The immune system responds to an antigen by either producing antibodies, which are specialized proteins, or cells that target the disease specifically.
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when you encounter a stressor, the sympathetic nervous system regulates the body to group of answer choices increase heart rate. dilate pupils. dilate coronary arteries. do all of the above.
Raising heart rate by pumping extra blood & oxygen to the muscles, this gets them ready for action. When you are exposed to a stressor, your sympathetic nervous system begins to work.
What is the sympathetic nervous system?The ability of our sympathetic nervous system to react to risky or stressful conditions is its most well-known function. When this happens, our sympathetic nervous system kicks in to help you escape danger by increasing your heart rate, pumping more blood to the parts of your body that need it, and other responses.
What kind of sympathetic nervous system is that?The sympathetic nervous system has the ability to increase blood pressure, enlarge bronchial passageways, decrease large intestine motility, constrict blood vessels, produce pupil dilation, generate goose bumps, and increase heart rate.
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The sympathetic nervous system triggers the body's "fight or flight" reaction when you are exposed to stressors. The goal of this reaction is to have the body ready to deal with threats or prospective threats.
The sympathetic nervous system activates when you come across a stressor?When this happens, your sympathetic nervous system kicks in to help you escape danger by increasing your heart rate, pumping more blood to areas of your body that need it, and other responses.
What impact does the sympathetic nervous system have on heart blood flow?Myocardial blood flow is increased by increased sympathetic activity due to the dilation of coronary resistance arteries. Endothelial function appears to be controlled, at least in part, by this vasodilator response.
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