The __________ is a thin fiber that carries signals away from the cell body.
During synaptic transmission, neurotransmitters release from one neuron and attach to a neighboring cell on the __________.
When the body experiences pain and intense exercise, it releases __________.
The human nervous system includes __________ of individual neurons that assist with __________ communication.
Which of the following is a major excitatory neurotransmitter?
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