Answers
The skeletal muscle, responsible for voluntary contraction is composed of 1) Myofilaments 2) Myofibrilles 3) Muscle fibers 4) Muscle (from the left to the right in the image)
What is the composition of the skeletal muscle?
The elements composing the skeletal muscle are,
Myofilaments ⇒ Actine and miosineSarcomere ⇒ It is the functional unit with the contractile apparatus. Composed of the Z band, A and I bands, and H zone.Myofibrilles ⇒ They have the Functional unitsMuscle fibers ⇒ Surrounded by endomysiumFascicle ⇒ Group of fibers surrounded by perimysium.Muscle ⇒ Group of fascicles surrounded by epimysium.The sarcomere is the contractile unit in a skeletal muscle. The thick myosin myofilaments are located in the central region of the sarcomere, which corresponds to the A band.
Thin filaments united to the Z lines, extends to the interior of the A band until they reach the border of the H band.
The I band is formed solely of thin actin filaments, belonging to two sarcomeres adjacent to a Z line.
When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in length of the sarcomere.
The H line and the I band get shorter. The Z lines get closer to the A band, meaning that they get closer to each other. The A band keeps constant in length.This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.For a better understanding about muscle contraction, look at the attached files.
From the left to the right,
1) Myofilaments
2) Myofibrilles
3) Muscle fibers
4) Muscle
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Related Questions
Which of these is the most important reason to reduce demand for renewable resources?
Answers
To allow resources to be replenished naturally is the most important reason to reduce demand for renewable resources.
The term "renewable resources" refers to natural resources that are replenished by nature. These are resources that can be used indefinitely and are replenished naturally, such as sunlight, water, and air, among others. Natural resource exploitation and consumption harm the ecosystem and cause pollution. Utilizing less natural resources, such as wood and fossil fuels, will safeguard both environmental and human health. A natural resource that can be replenished to replace the portion used up by usage and consumption is known as a renewable resource, also known as a flow resource. This replenishment can occur naturally through reproduction or through other recurring processes in a limited amount of time on a human time scale.
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What discoveries early-on helped man establish himself on Earth?
Answers
hammer
knife
fire
pottery (cooking)
rope (fishing)
Over a long period of time incomplete observations can be combined to form a complete explanation.
Answers
The given statement is about Abductive reasoning which begins with incomplete observations and then proceeds to find a complete explanation for the problem.
What is reasoning?Reasoning is the process in which one uses information, assertions to make predictions, draw conclusions and explanations.Deductive reasoning deals with specific assertion of a rule and then finds specific conclusion.Inductive reasoning begins with information that is specific and limited and then ends up in a broad, generalized conclusion based on evidence.Abductive reasoning deals with daily information which is often incomplete and then tries to find specific solutions which help in making decisions. In this, a person makes inferences by going from general information to specific conclusions.A person tries his best to find an appropriate explanation for an incomplete set of observations and make them complete.Learn more about reasoning here:
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What is Total Lung Capacity (TLC)?
Answers
Answer:
Lung capacity or total lung capacity (TLC) is the volume of air in the lungs upon the maximum effort of inspiration.
What is the function of the enzyme amylase?
Answers
Answer:
Explanation:
Amylases' main function is to hydrolyze the glycosidic bonds in starch molecules, converting complex carbohydrates to simple sugars. There are three main classes of amylase enzymes; Alpha-, beta- and gamma-amylase, and each act on different parts of the carbohydrate molecule
Which of the following
places is likely to have low
biodiversity?
OA. Great barrier reef
B. Man-made pine tree plantation
OC. Indian Ocean
OD. Amazon rainforest
Answers
Man made pine tree plantation is likely to have low biodiversity. Thus option B is correct .
What is biodiversity?Biodiversity is all the different kinds of life living in a particular area like the variety of animals, plants, fungi and microorganisms like bacteria and virus that plays a major role in framing of natural world usually three levels of biodiversity are observed and these are genetic species, and ecosystem diversity.
Biodiversity is very important for the process that's support all life present on earth including human.
Therefore, man made pine tree plantation is likely to have low biodiversity. Thus option B is correct .
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Without being in the presence of
light a producer cannot make
what?
A. sugars
C. H2O
B. CO2
D. oxygen
Answers
A producer cannot make sugars in the absence of light, the correct option is A.
What are producers?Producers, also known as autotrophs, are lifeforms that produce their own food.
They obtain energy from chemicals or the sun and transform it into usable energy in the form of sugar or food using water.
Plants and algae can produce their own food by harnessing solar energy. These organisms are referred to as producers because they generate their own food.
Thus, the correct option is A.
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What would happen if in a pcr reaction you used a dna polymerase isolated not from thermus aquaticus, but from an organism that grows at lower temperature?.
Answers
There would be very little or no DNA produced if in a pcr reaction you used a dna polymerase isolated not from thermus aquaticus, but from an organism that grows at lower temperature .
What is the purpose of PCR?
To amplify (copy) a gene so it can be detected.
How do the strands separate during PCR?
The hydrogen bonds between the two strands are broken by the DNA polymerase. During the annealing process, the primers split the strands. - The hydrogen bonds between the two strands are broken by the high heat of the denaturation stage.What is a PCR test ?
Targeting particular DNA fragments and amplifying (increasing in number) them artificially is done using the polymerase chain reaction technology. Describe how primers are used in PCR. The primer is a synthetic DNA strand that has bases that are complementary to the bases at the start of the DNA fragment that will be amplified.Learn more about PCR
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Why is the fossil record important?
A. It allows scientists to compare fossils to present day organisms and note changes.
B. It is fun to look at different animals.
C. The fossil record shows organisms that never lived on Earth.
D. The fossil record shows organisms that might live on Earth in the future.
Answers
Which choice uses a nonrenewable energy resource to generate energy?
biomass power plant
fireplace that burns wood
nuclear power plant
wind farm
heeellllp meeeeeeeeeeeeee!!!!!
Answers
Answer:
Explanation:
its the fireplace ahhhhhhhhhhhhhhhhh
Which of the following are financial securities that represent promises to repay a fixed amount of funds?
Which of the following is not a service that the financial system provides for savers and borrowers?
Answers
1. Bonds.
2. Guaranteeing savers high rates of return.
What is the purpose of the financial system?A financial system performs the role of an intermediary and makes it easier for money to move from areas of surplus to areas of deficit. It comprises various institutions, markets, rules and laws, customs, investors, analysts, transactions, and claims and liabilities.Managers can use big data in their businesses by using a financial system. A financial system combines data from numerous organizational departments into a single perspective, making it simple for users to comprehend the connections between distinct data types.Financial services guarantee the advancement of both domestic and international trade. Increased domestic and international exports of goods are guaranteed by the presence of factoring and forfeiting businesses. Banking and insurance services also facilitate an increase in these promotional activities.The following are financial securities that represent promises to repay a fixed amount of funds: Bonds.
Bonds provide a fixed amount of maturity value.The following is not a service that the financial system provides for savers and borrowers: Guaranteeing savers high rates of return.
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The somatic nervous system primarily controls _________ movements. The autonomic nervous system primarily controls movements.
A. relevant; irrelevant
B. involuntary; voluntary
C. voluntary; involuntary
D. irrelevant; relevant
Answers
Answer:
voluntary movements
Explanation:
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Too much logging in the Oyamel fir forests could lead to the eastern monarch butterfly going extinct because
Answers
Answer: They wouldn't have anywhere to live. The fir trees are a home to the butterflies cutting the trees means cutting their homes down.
Explanation:
so yea
Answer: A, the entire population of the species spends winter in oyamel
Type the correct answer in the box. Spell all words correctly.
What does natural resource management aim at?
Natural resource management aims at _____
management of resources.
Answers
The natural resource management aims at saving the natural resource for the coming generation without depriving the demand of the present generation. There must be a sufferable way to use the natural resources because unlimited use of resources will guide to some problems.
The natural resource management also seeks at using the natural resources in its pure shape and making it available to every possible place.
What are the advantages of natural resource management?
When watched for in the right way, they can help us to reduce flooding, enhance air quality and supply materials for construction. They also provide a home for some rare and stunning wildlife and iconic landscapes we can relish and which boost the economy via tourism.
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The Human Genome Project led to the development of several new fields of science. Which of these is one of those new fields?
A. Chemistry
C. Bioinformatics
B. Anatomy
D. Physics
Answers
Answer:C. Bioinformatics
Explanation:
Researchers are using bioinformatics to identify genes, establish their functions, and develop gene-based strategies for preventing, diagnosing, and treating disease.
One key research area was bioinformatics. Without the annotation provided via bioinformatics, the information gleaned from the HGP is not very useful.
difference between Cellular and Humoral immunity?
Answers
Cellular immunity kills pathogens inside the cell, whereas humoral immunity destroys pathogens outside the cell.
What is the difference between Cellular and Humoral immunity?The main difference between humoral and cell-mediated immunity is that humoral immunity produces antigen-specific antibodies, whereas cell-mediated immunity does not produce antigen-specific antibodies. The cellular immunity destroys pathogens and harm microbes that are present inside the cell, whereas humoral immunity kills pathogens outside the cell.
So we can conclude that cellular immunity kills pathogens inside the cell, whereas humoral immunity destroys pathogens outside the cell.
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30 points!! Please helppp!! It’s the last question!! The following diagram shows the branching tree for four kingdoms and some of their shared derived characteristics.
What shared characteristic can be written at point X? Use complete sentences to explain your answer.
Answers
These are synapomorphies, or shared derived features. These are the traits that arose in particular groups of creatures' progenitors and were then passed on to those groups' offspring (or lineages).
What is synapomorphies?A unique character or character state that has evolved from its ancestor is known as an apomorphy.An apomorphy that is shared by two or more taxa is referred to as a synapomorphy and is thought to have originated in those taxa's most recent common ancestor. Synapomorphy suggests homology in cladistics.A characteristic or trait obtained through evolution from a similar ancestral form and shared by two or more taxonomic groups.Synapomorphies are traits that a group of taxa share because they descended from a single ancestor. Thus, synapomorphies provide as proof of historical connections and the corresponding hierarchical structure.An advanced character state that is shared by two or more taxa and that is obtained through evolution.It is inherited from the most recent common ancestor, whose own ancestor is presumed not to contain such qualities.Learn more about synapomorphies here:
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Name one disadvantage of the electron microscope over the light microscope
Answers
Answer:
it is only used to view a dead specimen
Need help please with this
Answers
TSH controls hormone synthesis, ADH decreases urine, melatonin is involved in circadian rhythm, TH regulates metabolism, insulin is produced in the pancreas and Aldosterone regulates salt.
What is a hormone?A hormone is a chemical messenger used by the body to play a specific function and thus maintain homeostatic balance.
Hormones are secreted by specialized cells such as insulin that is secreted by pancreatic islet cells in this organ (i.e., the pancreas).
In conclusion, the function of TSH is to control hormone synthesis in the thyroid, ADH decreases the amount of urine, melatonin is involved in circadian rhythm, TH is a thyroid hormone that regulates metabolism, insulin is produced in the pancreas and Aldosterone regulates salt amount.
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For single celled, asexual organisms, cell division is used for ___.For multicellular organisms, simple cell division is used for___
a.growth and repair; growth, repair, and reproduction
b.reproduction; growth and repair
c.reproduction; growth, repair, and reproduction
d.growth, repair, and reproduction; growth, repair, and reproduction
Answers
Answer:
c. reproduction; growth and repair
Explanation:
When a cell divides, it creates new cells. In asexual single-celled organisms it used for reproduction only. However, in multicellular cells it is usually used for growth and repair. This is because multicellular organisms have levels of organisation (cells --> tissues --> organs --> organ systems --> organisms). The cells are the smallest components of the organism. So when a cell divides it can replace cells to repair tissues or organs. Single-celled organisms can't repair tissues and organs because they don't have any - they are made up of only one cell.
Proper functioning of our digestive system is due to the presence of
our diet.
Answers
Explain in your own words why there is uncertainty in science. What can scientists do to reduce uncertainty in science?
Answers
Scientists can reduce uncertainty by performing repeated hypothesis testing trough experiments or observations that exhibit the same predictive outcomes.
What is hypothesis testing?The expression 'hypothesis testing' makes reference to experimental and also observational methods used to test (either confirm or reject) a scientific hypothesis.
Hypothesis testing helps to reduce the level of uncertainty because the same results in different outcomes represent an excellent a measure of reliability by means of the scientific method.
In conclusion, scientists can reduce uncertainty by performing repeated hypothesis testing trough experiments or observations that exhibit the same predictive outcomes.
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soil fertility diagnosis
Answers
Answer:
Diagnostic testing for nitrogen soil fertility can provide a very effective guide to nitrogen fertilizer management. Diagnostic N testing requires sampling of the subsoil, at least to the third foot depth. The soil test N index is the total of nitrate-nitrogen from the surface layer to the depth sampled
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1. made of DNA holds genetic information
3. This type of ER transports and modifies lipids
4. type of respiration that does not use oxygen
6. Found only in plant cells, this surrounds the cell
8. the jelly like area in cell that hold organelles
13. type of transport that does not require energy
14. nerves that regulate responds to stimuli
Answers
Answer: im not sure
Explanation:
-What are plate boundaries?
-What types of boundaries are there?
-What usually happens when each type of boundary moves?
Answers
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d. Ecological relationships How many chromosomes does an individual human person have? a. 23 b. 46 c. 64 d.82
Answers
Answer:
there is 46 chromosome in a human
Answer: there is 46 chromosome in a person
Explanation:
Cystic fibrosis is a recessively inherited disorder that results from a mutation in the gene encoding CFTR chloride ion channels located on the surface of many epithelial cells. As shown in the figure, the mutation prevents the normal movement of chloride ions from the cytosol of the cell to the extracellular fluid. As a consequence of the mutation, the mucus layer that is normally present on the surface of the cells becomes exceptionally dehydrated and viscous.
An answer to which of the following questions would provide the most information about the association between the CFTR mutation and the viscous mucus?
O Is the mucus also secreted from the cells through the CFTR proteins?
O What is the change in nucleotide sequence that results in the CFTR mutation?
O How does the disrupted chloride movement affect the movement of sodium ions and
water by the cell?
O How does the mutation alter the structure of the CFTR proteins?
Answers
Answer:
the answer is b because it's right
Proper functioning of our digestive system is due to the presence of
Answers
Proper functioning of our digestive system is due to the presence of Fiber/roughage in our diet.
Explanation:The consumption of roughage, or fiber, has long been recommended as a way to alleviate digestive issues, such as constipation. However, it also plays a number of other critical roles in the body as well. As an example, plant foods are rich in fiber that can promote optimal gut health, keep you at a healthy weight, and even reduce your risk of heart disease. This is because they provide a healthy source of roughage.
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what is the Krebs cycle?
Answers
Answer:
Citric acid cycle
Explanation:
It is a series of chemical reaction s to release stored energy through oxidation of acetly-CoA derived from carbohydrates, fats and proteins
Vital capacity (VC) Next instruct your subject to breathe several normal breaths, then bend over and exhale maximally. After they have exhaled as much air as possible, ask them to stand upright and inhale as much air as possible. Then, quickly place the mouthpiece to their mouth and exhale as forcibly and as long as possible. Three measurements were taken.
a. Measurement 1: 4,500
b. Measurement 2: 4,570
c. Measurement 3: 4,480
Calculate the average vital capacity (VC). Round to the ne number.
Your lab partners average vital capacity (VC) is type your answer... ml.
Answers
My lab partner's average vital capacity is 4850ml
Why we are taking the average Value?The highest amount of air a person may inhale before reaching maximal expiration is known as vital capacity (VC). It is equivalent to the total of the inspiratory, tidal, and expiratory reserve volumes. The ability to absorb oxygen will increase the amount of oxygen delivered to the muscles. This implies that one can exercise longer and with less effort.
• There may be some variation in forceful inspiration and expiration for that reason we are taking the average value.
• Calculation : {(4500+5570+4480) ÷ 3} = {14550÷3 } = 4850ml
So the average value of Vital Capacity of the lab partner is 4850ml.
For better understanding one can check the attached image .
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