In neuronal communication, involves moving a neurotransmitter from the synapse back into the axon terminal from which it was released.

In neuronal communication, _reuptake_ involves moving a neurotransmitter from the synapse back into the axon terminal from which it was released

Reuptake is the reabsorption of a neurotransmitter by a neurotransmitter located along an axon terminal's plasma membrane (i.e., the pre-synaptic neuron at a synapse) or glial cell after performing its role of transmitting a neural impulse.

b. the carbon cycle ensures living things have a source of hydrogen