AP Psychology Practice Test

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Study for the AP Psychology Exam with a comprehensive quiz that includes flashcards and multiple choice questions. Each question is accompanied by hints and explanations to enhance understanding. Prepare effectively for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What function does acetylcholine serve?

It encases fibers of neurons
It helps in the digestion of food
It triggers muscle contraction
It controls blood pressure

The correct answer is: 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.