MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of these events must occur first to trigger the skeletal muscle to generate an action potential and contract:
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acetylcholine (ACh) causes temporary permeability to sodium
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acetylcholinesterase (AchE) breaks down acetylcholine (ACh)
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operation of the sodium-potassium pump
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diffusion of potassium ions out of the cell
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Explanation:
Detailed explanation-1: -Answer and Explanation: The correct answer is (c): calcium ions enter the synaptic bulb. Triggering the contraction of skeletal muscle fibers involves the stimulation of the fiber by its motor neuron.
Detailed explanation-2: -Muscle contraction is controlled by receptors in the muscle cell membranes that respond to the neurotransmitter acetylcholine when it is released from motor neurons.
There is 1 question to complete.