SAT Subject Biology Practice Question 53: Answer and Explanation

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Question: 53

2. Which precedes an action potential traveling down the axon of a neuron?

A. Neurotransmitters bind to receptors on the dendrite of the neuron.
B. Neurotransmitters are released from the axon terminals of the neuron.
C. The action potential travels through the synapse from a nearby neuron.
D. Vesicles in the axon terminal release their contents at the synapse.
E. The cell body releases neurotransmitters down the length of the axon.

Correct Answer: A

Explanation:

Action potentials are transmitted from input at the dendrites of a neuron, travel down the axon, and release neurotransmitters into the synapse between adjacent cells. These neurotransmitters bind to receptors on the dendrite of the second neuron, helping to produce a new action potential. Action potentials cannot travel through synapses.

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