PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following temporal sequences is correct for excitation-contraction coupling in skeletal muscle?
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Increased intracellular [Ca2+]; action potential in the muscle membrane; cross-bridge formation
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Action potential in the muscle membrane; depolarization of the T tubules; release of Ca2+ from the sarcoplasmic reticulum (SR)
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -During the phase of excitation-contraction coupling of skeletal muscle, what occurs immediately after the action potential spreads down the T tubule? Acetylcholine is released from the axon terminus.
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