A neuromuscular junction is a synapse:
A) where a sensory axon delivering information from a muscle meets a neuron.
B) where a motor neuron axon meets a muscle fiber.
C) specific to cardiac muscles.
D) where a muscle excites or inhibits a neuron.

Question

Quizplus · Accepted Answer

A neuromuscular junction is a synapse where a motor neuron axon meets a muscle fiber. This is where the motor neuron releases a neurotransmitter, acetylcholine, that binds to receptors on the muscle fiber, causing it to contract. Option A is incorrect because a sensory axon delivers information to the central nervous system, not to a muscle. Option C is incorrect because neuromuscular junctions are not specific to cardiac muscles. Option D is incorrect because muscles do not excite or inhibit neurons; rather, neurons excite or inhibit muscles.

A Neuromuscular Junction Is a Synapse