Select the correct sequence of events within a muscle cell to initiate contracti

Question

Select the correct sequence of events within a muscle cell to initiate contraction:

A) Ca++ released > Nerve impulse > myofilaments shorten

B) Nerve impulse > Calcium released > Troponin binds Ca++ > myosin binding sites revealed

C) Actin binds Ca++ > myosin reveals binding sites > nerve impulse shortens sarcomere

D) Nerve impulse > Ca++ released by sarcoplasmic reticulum > myosin and troponin form cross-bridge

E) Calcium release is the only step that initiates a muscle contraction

Thank you!

Explanation / Answer

D) Nerve impulse > Ca++ released by sarcoplasmic reticulum > myosin and troponin form cross-bridge

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