In reuptake
A. a neurotransmitter that has already been released into the synaptic cleft is taken back into the synaptic knob of the presynaptic neuron.
B. an action potential reverses direction.
C. a neuropeptide breaks down into amino acids, which act as neurotransmitters.
D. an enzyme breaks down a neurotransmitter and then another enzyme builds it back up.
Answer: A
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