![]() In essence, it is a chemical messenger that transports a signal from one cell to another. Only a small amount of hormone is required to alter cell metabolism. Thyrotropin-releasing hormone receptor Įpinephrine (adrenaline), a catecholamine-type hormoneĪ hormone (from Greek ὁρμή, "impetus") is a chemical released by a cell or a gland in one part of the body that sends out messages that affect cells in other parts of the organism. ![]()
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