BIOL 1010 Study Guide - Final Guide: Caffeine, Positive Feedback, Prolactin

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Classical definition: produced by specific glands in small quantities, secreted into the blood, act on target organ/s to affect their function. Broader definition: may be produced by cells in various tissues, may not be secreted into the blood but rather into the extracellular space (a case with insulin necessary for proper production of glucagon) Chemically hormones are categorized as: amino acid derived (modifications of amino acids, steroids (derived from cholesterol: cortisol, eicosanoids. Endocrine gland o o an organ/tissue that produces hormones ductless directly into blood (circulates) and acts on target organ (receptor) Hormones flow throughout the bloodstream and will affect tissues that consider to be targets for that hormone (non target tissues) What is necessary for a tissue to be a target organ o the capacity of an organ to chemically receive the hormone; depending on the type of hormone, we have different localizations and receptors. The same hormone molecule may be produced by various tissues;

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