Reuptake
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Reuptake is the process by which a neurotransmitter is pumped back into the neuron that released it, clearing the synapse.
Show
Serotonin left in the gap after signaling is drawn back into the sending neuron and stored for reuse.
Watch for
Clearing the synapse is not cleanup. Without it, the next signal cannot be distinguished from the last.