Question

Place the events of muscle contraction in the correct order. Selected Answer 1. ACh binds the...

Place the events of muscle contraction in the correct order.
Selected Answer
1.

ACh binds the nicotinic receptors at the neuromuscular juncton causing an electrical signal to develop along the muscle membrane.
2.

electrical signal from the motor neuron causes the release of ACh
3.

Calcium is pumped into the sarcoplasmic reticulum.
4.

The signal travels into the muscle cell along the T tubules.
5.

The electrical signal causes the sarcoplasmic reticulum to release calcium.
6.

"Calcium binds to the thin filament and allows the myosin heads, actin and ATP to form crossbridges."
7.

Myosin head rotates and moves the actin toward the center of the sarcomere.
8.

The sarcomere shortens.
9.

The muscle relaxes.
Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

1. Electrical signal from motor neuron causes the release of Ach.

2. Ach binds to the nicotinic receptor at neuromuscular junction causing an electrical signal to develop along the muscle membrane.

3. The signal travels into the muscle cell along the T tubules.

4. The electrical signal causes the sarcoplasmic reticulum to release calcium.

5.calcium binds to the thin filament and allows myosin, actin, ATP to form cross-bridges.

6. Myosin head rotates and moves the actin towards the centre of the sarcomere.

7. Sarcomere shortens.

8.muscle relaxes.

9.calcium pumped in the endoplasmic reticulum.

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