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
Marysya12 [62]
2 years ago
14

Describe the process of skeletal muscle contraction by assembling the following 10 events in the proper order in paragraph form.

Begin with an action potential traveling down a motor neuron to the neuromuscular junction and end with the muscle in its relaxed state. (5 points) 1) T and T system undergoes a conformational change, exposing the myosin binding sites on actin 2) myosin heads/cross bridges bind to actin and flex, shortening the sacromere 3) calcium ions bind to the T and T system 4) actin filaments are pulled toward the center of the sacromere, shortening the muscle fiber 5) muscle fiber is stimulated at the neuromuscular junction triggering an action potential 6) myosin head/cross-bridges bind to actin 7) APs travel down the T-tubules to the sarcoplasmic reticulum 8) in response to an AP, calcium ions are released into the cytosol/space around the myofibrils 9) calcium ions actively transported into the sarcoplasmic reticulum 10) myosin head continues to attach, flex, release, extend, and reattach as long as calcium ions are present
Biology
1 answer:
balu736 [363]2 years ago
3 0

5) muscle fiber is stimulated at the neuromuscular junction triggering an action potential  

7) APs travel down the T-tubules to the sarcoplasmic reticulum  

Released acetylcholine (due to action potential within motor neuron) from the motor neuron initiates depolarisation within the sarcolemma, which is spread through the muscle fibre via T tubules.

8) in response to an AP, calcium ions are released into the cytosol/space around the myofibrils

Depolarisation causes the sarcoplasmic reticulum to release calcium ions necessary for the contraction

3) calcium ions bind to the T and T system

1) T and T system undergoes a conformational change, exposing the myosin binding sites on actin  

6) myosin head/cross-bridges bind to actin

The binding sites for the myosin heads located on actin, are covered by a blocking complex (troponin and tropomyosin) that can be unblocked by the calcium binding

2) myosin heads/cross bridges bind to actin and flex, shortening the sacromere  

4) actin filaments are pulled toward the center of the sacromere, shortening the muscle fiber  

As the individual sarcomeres become shorten the muscle fibres as a whole contracts

10) myosin head continues to attach, flex, release, extend, and reattach as long as calcium ions are present

9) calcium ions actively transported into the sarcoplasmic reticulum  

Relaxation of a muscle fiber occurs when a Ca ions are pumped back into the sarcoplasmic reticulum .

You might be interested in
What is true about the Y chromosomes
AURORKA [14]

Answer:

The Y chromosome is present in males, who have one X and one Y chromosome, while females have two X chromosomes.Explanation:

4 0
3 years ago
Explain and answer these following questions.
andrew11 [14]
5a. the force moving object one place to the next
5b the force moving object without anything happening
5c the force moving a object and changing its position
7 0
3 years ago
Example of cells that are specialized for storage
anygoal [31]
Fat cells are specialised for storage
7 0
2 years ago
Que es una "verdura" propiamente?
soldier1979 [14.2K]
En general las verduras son alimentos de bajo contenido calórico, por lo que se emplean mucho en dietas hipocalóricas.
7 0
2 years ago
What does the energy pyramid demonstrate? A. A great amount of energy is gained moving up the energy pyramid. B. A great amount
Crazy boy [7]

The answer should be B

4 0
2 years ago
Read 2 more answers
Other questions:
  • Do all of the groups have the same number of branches or branch tips? what does this result indicate?
    10·1 answer
  • Compare ionic solids and liquids
    15·1 answer
  • When plants are stressed by dry conditions, they secrete the hormone abscisic acid (ABA) and in response the stomata close, even
    14·2 answers
  • congestive heart failure refers to which of the following? cardiac injury resulting from repeated myocardial infarctions right-h
    15·1 answer
  • WILL BE MARKED AS. BRAINLIEST The process of inflammation _____.
    9·2 answers
  • Which level has the most number of organisms but the least specific characteristics?
    10·1 answer
  • Nêu 2 cách hoạt động của glutathion trong tế bào hồng cầu
    14·1 answer
  • What is the purpose of motor nerve varicosities as they relate to smooth muscle?
    15·1 answer
  • Darwin proposed that homologous structures are evidence of
    9·1 answer
  • BRAINLIEST IF CORRECT. Match the term t to its definition.​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!