steps in muscle contraction

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10 Terms

1
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ACh is released into the neuromuscular junction.

2
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ACh binds to receptors, generating an action potential.

3
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The action potential spreads along the sarcolemma and T-tubules.

4
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The sarcoplasmic reticulum releases calcium.

5
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Calcium binds to troponin, shifting tropomyosin to expose binding sites.

6
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Myosin heads attach to actin.

7
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Myosin heads bend, pulling actin (power stroke).

8
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Sarcomere shortens, contracting the muscle.

9
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ATP binds to myosin, detaching it from actin and resetting the head.

10
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If calcium remains available, contraction continues.