BIOLOGY 2A03 Lecture Notes - Lecture 6: Posterior Pituitary, Thyroid, Natriuretic Peptide

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Endocrine system - hormones, travels through blood stream; slower signals. Has a delayed onset of efects but long duraion of efect endocrine - secretes to the ecf (blood) vs exocrine glands secretes to the outside (epithelium, through ducts) Endocrine related to nervous because: glands are under nervous control, neurohormones vs hormones, many substances are hormones and neurotransmiters ex. dopamine, hypothalamus -pituitary complex - neuroendrocrine interface. Hydrophobic hormones - difuse through membranes, bind to intracellular receptors. Hydrophilic hormones - secreted by exocytosis, and bind cell surface receptors. T3 and t4 types of thyroid hormones (2) protein and polypepide hormones: preprohormone cleaved using proteosome to form prohormone in er (cleaving of amino acids, prohormone is cleaved using proteosome to form hormone during packaging of vesicles in. Golgi (cleaving of amino acids: released out of cell by ca iniiated exocytosis, ex. Growth hormone (released by anterior pituitary: ex. Atrial natriureic pepide (released by heart so kidneys reabsorb sodium)

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