BIOLOGY 101 Lecture Notes - Lecture 12: Adrenal Gland, Thyroid, Lipid Bilayer

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Lipid-soluble hormones: mo(cid:448)e easil(cid:455) through a(cid:374)(cid:455) target (cid:272)ell"s plas(cid:373)a (cid:373)e(cid:373)(cid:271)ra(cid:374)e, once inside the target cell, the steroid hormone combines with receptor molecules. In the nucleus, the hormone-receptor complex attaches to dna and activates certain genes to synthesize specific proteins. Regulation of homeostasis occur through negative feedback: as a variable (blood glucose concentration) moves away from normal values (70 - 100 mg/dl), compensatory mechanism are active to bring the variable back into the normal range. The positive feedback cycle: move away from norm we speed up the process, positive feedback systems require an event to break the cycle, examples, ovulation, child birth. Anterior pituitary hormones (six): gh, prl, tsh, acth, fsh, and lh: prolactin (prl) In females, stimulates the mammary glands to produce milk. In excess can cause infertility and lactation when birth has not occurred. In males, involved in the production of mature sperm in the testes. In females, promotes development of egg cells and secretion of estrogen.

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