In Reuptake

Multiple Choice

In reuptake

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