Which of the Following Events in Muscle Contraction Is the Last

question 19

Multiple Choice

Which of the following events in muscle contraction is the last to occur chronologically?

• 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 has an action potential.
• E) The binding of acetylcholine causes a skeletal sarcolemma to have an action potential.

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