A neurotransmitter's reabsorption by the sending neuron is called what?

• A. Neurotransmitters
• B. Threshold
• C. Synapse
• D. Reuptake

Answer: (D)

Reuptake is the process of clearing a neurotransmitter from the synapse by pulling it back into the sending neuron. After a neuron releases a chemical messenger into the synaptic gap to pass the signal to the next neuron, the signal needs to be turned off so the system can reset. Transporter proteins in the presynaptic membrane reclaim these neurotransmitters, effectively reabsorbing them for reuse. This termination-and-recycling mechanism is what reuptake describes.

Neurotransmitters are the chemical messengers themselves, not the clearing process. The threshold refers to the minimum stimulus needed to trigger an action potential, and the synapse is simply the gap where communication between neurons occurs.