Multiple Choice
Which of the following events occurs first during a voluntary muscle contraction?
A) The T-tubules depolarize,causing calcium to be released from the sarcoplasmic reticulum.
B) Calcium is resequestered (taken up) into the sarcoplasmic reticulum.
C) Tropomyosin moves,exposing the actin active sites.
D) The innervating alpha-motor neuron reaches an action potential.
Correct Answer:
Verified
Correct Answer:
Verified
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