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communication molecules, signals to nerve cells /neurons, messenger…
communication molecules
receptors
proteins that bind to ligands and effect some type of change
either on surface of cell, membrane imbedded, or free in solution
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messenger classes
cholingergic, AA, adrenergic, peptidergic, sterioids
neurotransmitters belong to all five, hormones to the last 3
hormones are secreted by specific tissue, released into the blood stream, and adsorbed onto specific receptor sites far from their source
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