PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What happens right after the nerve dumps acetylcholine into the synapse?
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muscle depolarizes
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nerve depolarizes
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vesicles dump acetylcholine into the synpse
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muscle contracts
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everything resets, ready to contract again
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Explanation:
Detailed explanation-1: -Once released by the synaptic terminal, ACh diffuses across the synaptic cleft to the motor end plate, where it binds with ACh receptors. As a neurotransmitter binds, these ion channels open, and Na+ ions cross the membrane into the muscle cell.
Detailed explanation-2: -When acetylcholine binds to these two chains, the shape of the entire receptor changes slightly, opening the channel. This allows positively charged ions, such as sodium, potassium, and calcium, to cross the membrane.
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