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(A) Muscle contraction is initiated by a signal sent by the central nervous system $(CNS)$ via a motor neuron. When the action potential reaches the a

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acetyl choline

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(A) Muscle contraction is initiated by a signal sent by the central nervous system $(CNS)$ via a motor neuron. When the action potential reaches the axon terminal of the motor neuron, it triggers the release of a neurotransmitter called acetylcholine into the synaptic cleft. This acetylcholine binds to the receptors on the sarcolemma of the muscle fiber, generating an action potential that leads to muscle contraction.

Muscle contraction is initiated by a signal sent by the central nervous system by the release of . . . . . . .

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