PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Neurotransmitter responsible for the opening of the Na+ channel in the sarcolemma.
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troponin
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calcium
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acetylcholine
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myosin
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Explanation:
Detailed explanation-1: -The receptors are actually sodium channels that open to allow the passage of Na+ into the cell when they receive a neurotransmitter signal. Acetylcholine (ACh) is a neurotransmitter released by motor neurons that binds to receptors in the motor end plate.
Detailed explanation-2: -For example, when acetylcholine is released at the synapse between a nerve and muscle (called the neuromuscular junction) by a presynaptic neuron, it causes postsynaptic Na+ channels to open.
Detailed explanation-3: -Acetylcholine binds to receptors on the plasma membrane-sarcolemma-of the muscle fiber, allowing an action potential to move to the endoplasmic reticulum where calcium ions are stored.
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