With Regard to Skeletal Muscle Contraction,which Event Comes First

Question

With regard to skeletal muscle contraction,which event comes first?
A) Cross-bridge formation between actin and myosin
B) Release of calcium from the sarcoplasmic reticulum
C) Activation of the NM receptor within the neuromuscular junction
D) Release of neurotransmitter (ACh) from the somatic motor neuron

Accepted Answer

The first event in the sequence leading to skeletal muscle contraction is the release of the neurotransmitter acetylcholine (ACh) from the somatic motor neuron into the neuromuscular junction. This event is crucial for initiating the subsequent steps that lead to muscle contraction.