AP Psychology Practice Test 2025 - Free AP Psychology Practice Questions and Study Guide

Question: 1 / 530

What function does acetylcholine serve?

It encases fibers of neurons

It helps in the digestion of food

It triggers muscle contraction

Acetylcholine plays a crucial role as a neurotransmitter in the nervous system, and one of its primary functions is to trigger muscle contraction. When released at the neuromuscular junction, acetylcholine binds to receptors on muscle fibers, leading to the depolarization of the muscle cell membrane. This initiates a cascade of events that ultimately results in muscle contraction. This mechanism is vital for voluntary movements, such as those used in walking or lifting objects.

While other substances may impact bodily functions related to digestion, blood pressure, or neuronal insulation, acetylcholine is specifically associated with the initiation of muscle activity, making it essential for motor control and overall muscle function.

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It controls blood pressure

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