Question

spotlight figure 10.10: neuromuscular junction (nmj) 4 parts 0.25 of 1 point part b (2 of 4) - events at nmj 3 tries left which of the following events directly occurs due to an action potential generated on the motor neuron? choose the best answer. ach binds to ach receptors. ach is released at the synapse. an action potential is generated on the muscle fiber. ache breaks down ach in the synaptic cleft. na⁺ rushes into the sarcolemma.

Explanation:

When an action potential reaches the axon terminal of a motor neuron, it causes voltage - gated calcium channels to open. Calcium influx triggers the release of acetylcholine (ACh) from synaptic vesicles into the synapse. ACh binding to receptors, generation of action potential in muscle fiber, AChE breakdown of ACh, and sodium influx into the sarcolemma occur later in the process.

Answer:

B. ACh is released at the synapse.