Answer: E. exocytosis and it requires expenditure of ATP
Explanation:
Neurotransmitters are molecules released by synaptic pre-neurons and are the means of communication in a chemical synapse. They bind to neurotransmitter receptors and can attach to an ion channel (ionotropic receptors) or an intracellular signaling process (metabotropic receptors). Neurotransmitters are specific for the receptor they bind to and elicit a specific response in postsynaptic neurons, resulting in an excitatory or inhibitory signal. Because exocytosis is an example of active transport, it requires expenditure of ATP.
