PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the function of acetylcholine?
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ACh binds to receptors on the sarcolemma and opens ion channels
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ACh binds to receptors on the sarcolemma and closes ion channels
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ACh binds to ion channels and open them
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ACh binds to ion channels and closes them
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Explanation:
Detailed explanation-1: -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.
Detailed explanation-2: -(A) Acetylcholine (ACh) is synthesized, stored and released by cholinergic neurons. ACh is released from presynaptic neurons and binds to the nAChR of postsynaptic neurons to modulate the flow of ions across the cell membrane.
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