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