Neurotransmitter is Stored and Released From

Question

Neurotransmitter is stored and released from
A) axon terminals only.
B) axon varicosities only.
C) dendritic spines only.
D) cell bodies only.
E) axon terminals and axon varicosities.

Accepted Answer

Neurotransmitter is stored and released from both axon terminals and axon varicosities. Axon terminals are the knobs at the end of axons which contain vesicles filled with neurotransmitter, and they are responsible for making synaptic contacts with other neurons. Axon varicosities are the small swellings along the axons of some neurons which also contain vesicles filled with neurotransmitter, and they are responsible for releasing neurotransmitter at specialized synapses called neuromuscular junctions or varicosities.