PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of these occurs first during a muscle contraction?
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The nerve signal reaches the neuromuscular junction
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Ach is released and opens Na ion channels
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The sarcomere shortens
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The myosin binds to the actin
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Explanation:
Detailed explanation-1: -For a contraction to occur there must first be a stimulation of the muscle in the form of an impulse (action potential) from a motor neuron (nerve that connects to muscle). Note that one motor neuron does not stimulate the entire muscle but only a number of muscle fibres within a muscle.
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