Question

consider how the action potential that initiates contraction is delivered to the muscle cell. which of the choices below correctly describes how an action potential generated at the neuromuscular junction (nmj) is converted to excitation in the muscle fiber?

Answer 1

ACh is released into the synaptic cleft in response to an action potential in the motor neuron. Gradient potentials are started when ACh binds to sarcolemma receptors.

What triggers a muscle contraction when an action potential occurs?

The ryanodine receptors (RyRs) in the SR also open and release calcium as a result of the action potential's invasion of the T-tubules, which opens the L-type calcium channels and stimulates contraction.\

Sodium ions within a muscle cell start the action potential. When a muscle contracts, calcium ions are released into the muscle cell, strengthening the muscle. This occurs after the cell becomes positive, starting the action potential.

ACh is released into the synaptic cleft in response to a motor neuron action potential.

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