BIOL 1080 Lecture Notes - Lecture 9: Homeostasis, Astrocyte, Positive Feedback

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Hormones regulate growth and development, homeostasis and reproduction. Hypothalamus is stimulated by the sex hormones, and the growth hormone is released into the bones, liver and muscles, through the anterior pituitary gland. Growth hormones promotes lipolysis in adipose tissue (breaks down fat) Positive feedback loop : baby suckles, stimulating nerve receptors, resulting impules travels to the hypothalamus, where the posterior gland is stimulated to release ot, travels to the mammary glands through the blood, where milk is then ejected. Slides 7 & 8 : review in ppt. Nerve signals, via local neurotransmitter release, can modulate hormone secretion. e. g. norepi: epi; insulin. Neurons in the cns and pns - along with astrocytes in the cns and astrocyte-like cells in the pns - have receptors for many hormones. (i. e. insulin (hydrophilic) and estrogen (lipophilic)) Posterior and anterior glands, where anterior releases oxytocin and adh (anti diuretic hormone), and posterior releases everything else. (note, anterior is more like a group of nerve endings)

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