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Unformatted text preview: o catecholamines - secreted by adrenal medulla, includes adrenaline/noradrenaline o melatonin, thyroid hormone steroids- lipids derived form cholesterol o sex steroids - secreted by testes, ovaries, placenta, adrenal cortex o corticosteroids - secreted only by adrenal gland lilophilic hormones - fat soluble, includes steroids/thyroxine lilophobic hormones - water soluble, all other hormones most releases of hormones controlled by the brain hormones that enter cells- lipophilic hormones easily enter cells (can pass plasma membrane) either finds receptor in cytoplasm or inside nucleus (either way, eventually reaches nucleus) hormone response elements - DNA segments binding to hormones hormones that do not enter cells- lipophobic hormones cant pass plasma membrane have to bind to receptors 2nd messenger needed within the cell to get the reactions started...
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- Fall '10