PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Calcium enters the muscle tissue
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Cause sodium ions to enter the muscle
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Cause potassium ions to exit the muscle
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Cause acetylcholine to be released
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Detailed explanation-1: -Extracellular calcium ions enter the axon terminal via the voltage-gated calcium channels. These calcium ions then attach to the vesicles that contain ACh. The attachment of the calcium ions to the vesicles causes the release of ACh in the synaptic cleft.
Detailed explanation-2: -The release of acetylcholine occurs when an action potential is relayed and reaches the axon terminus in which depolarization causes voltage-gated calcium channels to open and conduct an influx of calcium, which will allow the vesicles containing acetylcholine for release into the synaptic cleft.
Detailed explanation-3: -Once released from the end of the nerve cell, it moves into a space called the synaptic cleft. The synaptic cleft is between the nerve cell from which acetylcholine was released (the presynaptic nerve cell) and the next nerve cell acetylcholine is going to (the postsynaptic nerve cell).