sequence of muscle contraction

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7 Terms

1
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electrochemical signal causes release of calcium from the sarcoplasmic reticulum

1st

2
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calcium ions bind to troponin, causing a conformational change of the thin filament (actin)

2nd

3
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the tropomyosin shifts, exposing the binding sites on the actin

3rd

4
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myosin heads bind to the actin

4th

5
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power stroke occurs… the myosin head pulls the actin in toward the M line

5th

6
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ATP binds tot he myosin head, allowing it to detach from the actin

6th

7
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the actin returns to its relaxed state

7th