Final answer:
Neurotransmitters, including amino acids, are composed of a variety of chemicals and play a crucial role in neurotransmission. Glutamate, GABA, and glycine are examples of amino acid neurotransmitters that have their own systems and receptors. They are cleared from the synapse by reuptake and recycled.
Step-by-step explanation:
Neurotransmitters, which are endogenous chemicals that enable neurotransmission, are composed of a variety of different chemicals including amino acids. Amino acid neurotransmitters such as glutamate, GABA, and glycine are part of their own systems, namely the glutamatergic, GABAergic, and glycinergic systems. Each of these amino acids have their own receptors and do not interact with each other. They are eliminated from the synapse by reuptake and recycled for future use.