Neurophysiology and Synapses · USMLE Step 1

Which of the following best describes the primary function of a synapse in the nervous system?

  1. It generates action potentials to initiate muscle contraction directly.
  2. It lets a neuron pass an electrical or chemical signal to another cell.
  3. It continuously synthesizes and stores neurotransmitters for later use.
  4. It maintains the neuron's resting membrane potential at rest.
Show answer and explanation

Correct answer: It lets a neuron pass an electrical or chemical signal to another cell.

A synapse is the junction that allows one neuron to transmit a signal (either electrical or chemical) to another neuron or to a target effector cell. This is the fundamental unit of neural communication.

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