When an electrical impulse traveling along a motor neuron arrives at a neuromuscular junction
A) there is an increase in the secretion of acetylcholine at the neuromuscular junction.
B) calcium is transported back to the sarcoplasmic reticulum.
C) sliding of actin and myosin filaments is inhibited.
D) myosin-actin cross-bridges are destroyed.
E) a new electrical impulse is generated that returns the message to the original nerve.

Question

Quizplus · Accepted Answer

The arrival of an electrical impulse at a neuromuscular junction triggers the release of acetylcholine, a neurotransmitter, into the synaptic cleft, facilitating muscle contraction.

When an Electrical Impulse Traveling Along a Motor Neuron Arrives