Question

practice it
small knob at the end of the axon that releases neurotransmitters
neurotransmitter
dendrite
cell body
terminal button
axon

Explanation:

A terminal button is the small knob at the end of the axon that releases neurotransmitters. Neurotransmitters are chemical messengers. Dendrites receive signals, the cell - body contains the nucleus and other organelles, and the axon is a long fiber that transmits electrical impulses.

Answer:

D. terminal button