What class of neurochemicals acts like neurotransmitters but tend to be more specialized in their roles?

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Neuropeptides act like neurotransmitters but tend to be more specialized in their roles. They are generally produced in the cell body of neurons and then transported to their target cells, where they act as neuromodulators, affecting the release or uptake of other neurotransmitters. They can also act as hormones, being released into the bloodstream and affecting the function of distant cells and organs. Glial cells are non-neuronal cells that provide support and insulation for neurons. Monoamines are a class of neurotransmitters that includes dopamine, serotonin, and norepinephrine. IPSPs (inhibitory postsynaptic potentials) are a type of graded potential that hyperpolarize neurons, making them less likely to fire an action potential.

What Class of Neurochemicals Acts Like Neurotransmitters but Tend to Be