When a presynaptic neuron is stimulated in a patient's body by an electrical current, neurotrans-mitters are released from the:
a. synapse.
b. synaptic bouton.
c. synaptic cleft.
d. receptor.
ANS: B
When an impulse originates in a presynaptic neuron, the impulse reaches the vesicles, where chemicals (neurotransmitters) are stored in the synaptic bouton. Neurons are not physically con-tinuous with one another. The region between adjacent neurons is called a synapse. The synaptic cleft is the space between the neurons. Neurotransmitters attach to the receptor.
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