PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Relaxation
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No response
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Contraction
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Initiating sleep
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Detailed explanation-1: -This control is achieved through the transfer of action potential from the nerve to the target muscle with the help of a neurotransmitter so that nerve impulse can be converted to appropriate muscle contraction of the skeletal, smooth, or cardiac muscle.
Detailed explanation-2: -(A) Neurotransmitter (acetylcholine, ACh) released from nerve endings binds to receptors (AChRs) on the muscle surface. The ensuing depolarization causes sodium channels to open, which elicits an action potential that propagates along the cell.
Detailed explanation-3: -When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber.