Transmission of the nerve signal across a synapse is...

Transmission of the nerve signal across a synapse is accomplished by the a. movement of $\mathrm{Na}^{+}$ and $\mathrm{K}^{+}$. b. release of a neurotransmitter by a dendrite. c. release of a neurotransmitter by an axon. d. release of a neurotransmitter by a cell body. e. All of these are correct.

Transmission of the nerve signal across a synapse is accomplished by the
a. movement of $\mathrm{Na}^{+}$ and $\mathrm{K}^{+}$.
b. release of a neurotransmitter by a dendrite.
c. release of a neurotransmitter by an axon.
d. release of a neurotransmitter by a cell body.
e. All of these are correct.

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Key Concepts

Axon Terminal

The axon terminal is the endpoint of the axon where the action potential causes the release of neurotransmitters. It is specialized for signal transmission, containing the necessary vesicles and machinery to convert the electrical impulse into a chemical signal that can cross the synaptic gap and be received by the next cell.

Synaptic Transmission

Synaptic transmission is the process by which neurons communicate with one another. An action potential reaches the axon terminal of the presynaptic neuron, triggering the fusion of neurotransmitter-containing vesicles with the membrane, and releasing these chemical messengers into the synaptic cleft. They then bind to receptors on the postsynaptic neuron to propagate the signal.

Neurotransmitter Release

Neurotransmitter release is the mechanism that converts electrical signals into chemical signals at the synapse. This release occurs at the axon terminal, where the arrival of an action potential causes the opening of voltage-gated calcium channels. The influx of calcium triggers synaptic vesicles to merge with the membrane, releasing neurotransmitters into the synaptic space.

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