while hormones are chemical messengers produced by the endocrine system and released into the blood stream.

? The four chemical classes of neurotransmitters are small-molecule transmitters, neuropeptides, neurotransmitter-containing vesicles, and co-transmitters. Small-molecule transmitters are the simplest type of neurotransmitter and are composed of non-protein molecules, such as amino acids or monoamines. They are released directly into the synaptic cleft when an action potential reaches the axon terminal and bind to postsynaptic …

Which Of The Following Is Not A Chemical Class Of Neurotransmitters Read More »