1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
patriot [66]
3 years ago
5

Which of the following is the correct sequence of events for muscle contractions?a) motor neuron action potential, meurotransmit

ter release, muscle cell action potential, release of calcium ions from SR, AtP-driven power stroke, sliding of myofilamentsb) neurotransmitter release, muscle cell action potential, motor reuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power strokec) muslce cell action potential, neurotransmitter release, atp-driven power stroke, calcium ion release from SR, sliding of myofilamentsd) neurotransmitter rlease, motor neuron cation potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
Biology
1 answer:
alexandr402 [8]3 years ago
7 0

The answer is; A

When an impulse from the motor neuron reached the neuromuscular junction,  the voltage-dependent calcium channels are activated and the neurotransmitter released from the presynaptic cleft. When the neurotransmitter binds to their receptors on the sarcolemma, the muscle fibers become depolarised; the calcium is released from their vesicles. The Ca2+ ions are important in the power stroke because they bind to troponin. Upon binding calcium, troponin moves tropomyosin away from the myosin-binding sites on actin. Powered by the energy from ATP molecule,  the myosin is able to bind on the actin and slides over the actin filament.

You might be interested in
What happens to the DNA in cell during interphase?
UkoKoshka [18]

Answer:

The cell copies its DNA

Explanation:

3 0
3 years ago
Read 2 more answers
What is simple diffusion
diamong [38]
Simple diffusion is.........
6 0
3 years ago
Read 2 more answers
A translocation that moves a gene from an area of euchromatin to heterochromatin would typically cause a(n) ________ in the expr
Advocard [28]

A translocation that moves a gene from an area of euchromatin to heterochromatin would typically cause a(n) reduction in the expression of the gene.

<h3>What is euchromatin?</h3>
  • A kind of chromatin that is sparsely packed, enriched in genes, and frequently engaged in transcription is called euchromatin.
  • Contrasting with heterochromatin, which is compact and less accessible for transcription, is euchromatin.
  • The human genome has 92% euchromatic DNA.
<h3>What is heterochromatin?</h3>
  • Heterochromatin, often known as condensed DNA or densely packed DNA, has many different types.
  • Between constitutive heterochromatin and facultative heterochromatin, these variations fall on a spectrum. Both contribute to how genes are expressed.
  • Eukaryotic genomes contain heterochromatin, which serves a variety of purposes including regulating gene expression and preventing DNA replication and repair.

Learn more about euchromatin here:

brainly.com/question/12318627

#SPJ4

3 0
1 year ago
An enzyme was isolated from digestive juices taken from the small intestine. an experiment was set up to test the ability of the
Sergio039 [100]
1. Our results showed that test tube B contained end products of protein digestion, meaning that the isolated enzyme has the ability to break down protein. The end products of protein digestion include small polypeptides, dipeptides, and amino acids. In general, test tube B will contain the building blocks of proteins, which are the amino acids.

2. The two test tubes were placed in a hot water bath at 37oC. This is because the enzyme studied is a human enzyme and it works best at the human body temperature, which is approximately 37oC.
Enzymes are biological catalysts, which means that they accelerate chemical reactions. As a result, an enzyme's activity is greatly affected by temperature. Every enzyme, depending on each function and origin, has a specific range of ideal temperature conditions. If the temperature rises above the maximum accepted, then the enzyme denatures and loses its structure.

3. If the enzyme studied was added in a tube containing starch instead of proteins, then nothing would happen. This is because the enzymes are highly specialized and have very specific actions. It has been proved that this enzyme's activity involves the digestion of proteins.
Starch is a polysaccharide produced by plants, this means that starch is a carbohydrate. Given that starch is not a protein, it will not be digested by the enzyme. An enzyme digesting proteins, will not have any effect on carbohydrates.

4. The smaller molecules which are the result of the digestion happening in the digestive system are absorbed by the human body. More specifically, the products of protein digestion are absorbed by the intestine and then transported into the bloodstream. From the blood, they are then absorbed by other tissues.
After they are absorbed, they are used to build muscles or other compounds which can produce energy.
6 0
3 years ago
Which structure is found in viruses, prokaryotic cells, and eukaryotic cells?
MatroZZZ [7]
The answer is a cellular membrane
4 0
3 years ago
Other questions:
  • The peripheral nervous system consists of all the nervous tissue external to the cns true or false
    6·2 answers
  • Conservation biologists provide strong arguments about why we should all care about preserving biodiversity. When considering th
    10·1 answer
  • "Slab pull" is a type of tectonic plate movement that occurs due to the forces of mantle convection and results in the subductio
    13·1 answer
  • The enzyme phosphorylase kinase catalyzes a modification of glycogen phosphorylase that controls its activity. How does phosphor
    6·1 answer
  • What occurs at step 1 in the diagram
    7·1 answer
  • Allopatric speciation is another name for
    7·2 answers
  • Using the Karyotype above, what chromosome has an error?<br> 1<br> 21<br> X<br> Y
    13·1 answer
  • 1. If a snail is a ​consumer​, you can conclude that it ​releases ​which ​gas ​into their environment as a result of ​respiratio
    13·1 answer
  • Please help
    10·1 answer
  • Put in your own words about fighting cancer cell
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!