Which of the Following Events Occurs First During a Voluntary

question 17

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.

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