At a neuromuscular junction, synaptic vesicles discharge ______.
Explanation: Synaptic vesicles contain neurotransmitters such as acetylcholine, neuropeptides, catecholamines, etc. Adrenaline or epinephrine is a hormone released by the adrenal gland. It is also released by a few cells in the central nervous system and acts as a neurotransmitter.
