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affects secretory cell itself or cells of the same tissue type within an organ


secreted by one tissue type within an organ and affect other cell types within the organ


released into bloodstream and can affect distant targets


hormones that are secreted by ductless glands


secreted by ducted glands


derived from amino acids tyrosine and tryptophan


secreted by the adrenal medulla, derived from amino acid tyrosine; epinephrine and norepinephrine, water soluble

thyroid hormones

secreted by the thyroid gland, two derivatives of tyrosine bonded together; T4 and T3, lipophilic


secreted by the pineal gland, involved in reproductive ccles, derived from tryptophan


fewer than 100 amino acids long, large and polar, cannot pass through membrane of target cell

steroid hormones

common four ring structure of sterols, synthesized in adrenal cortex and gonads, cholesterol is a precursor, lipophilic


long polypeptide, large and polar, cannot pass through membrane of target cell


hormones bind to these specific things in or on target cells

catecholamines peptides glycoproteins

receptors embeded in plasma membrane of target cells

steroid hormones thyroid hormones

receptors located inside of the target cell

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