Which part of the neuron is responsible for the release of neurotransmitters?

Question

BlackTom AI · Accepted Answer

To tackle this question, I’ll evaluate what each neuron structure does in relation to neurotransmitter release.
Option 1: Terminal button. This structure, also called the axon terminal or synaptic bouton, houses synaptic vesicles filled with neurotransmitters and is the site where they are released into the synaptic cleft in response to an action potential. This makes it the correct choice for the release of neurotransmitters.
Option 2: Dendrites. Dendrites are primarily responsible for receiving signals from other neurons. They contain receptors to detect neurotransmitters, but they do not release neurotransmitters themselves, so this option describes input reception rather than release.
Option 3: Synapse. The synapse is the gap or junction between neurons where neurotransmitters cross from the presynaptic terminal to the postsynaptic membrane. It is a functional site of communication rather than a cellular structure that releases chemicals itself. Thus it’s not the release terminal.
Option 4: Axon. The axon conducts electrical impulses away from the cell body toward the terminals, transmitting the signal along its length. While the axon leads to the release site, the actual release occurs at the terminal button, not along the main shaft of the axon.
In summary, the terminal button is the specific location at the end of the neuron where vesicles release neurotransmitters into the synaptic cleft, whereas dendrites, the synapse as a gap, and the axon’s main body participate in other aspects of neuronal signaling.

PSYC10003_2025_SM1 Exam: Mind, Brain & Behaviour 1 (PSYC10003_2025_SM1)

Which part of the neuron is responsible for the release of neurotransmitters?

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