Which of the following events occurs during the lag phase of a muscle twitch?

A. Muscle fibers shorten.
B. Cross-bridges form, move, release, and reform many times.
C. The action potential is propagated from presynaptic to postsynaptic membrane.
D. Calcium is pumped back into the sarcoplasmic reticulum.
E. All of these events occur in the lag phase.


C

Anatomy & Physiology

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