Which of the following events occurs during the lag phase of a muscle twitch?
A. Ca2+ are pumped back into the sarcoplasmic reticulum.
B. Muscle fibers shorten.
C. Cross-bridges form, move, release, and reform many times.
D. The action potential is propagated from presynaptic to postsynaptic membrane.
E. All of these events occur in the lag phase.
Answer: D
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Answer the following statement true (T) or false (F)
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What will be an ideal response?