lecture13

lecture13 - Life Science 15: Concepts and Issues Lecture...

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Life Science 15: Concepts and Issues Lecture 13: The trouble with testosterone: hormones and sex differences 2/21/12 Hormones: Chemical signals, secreted into body fluids May reach many cells, but only target cells respond Elicit specific responses in target cells What secretes them? Pineal- melatonin Hypothalamus Pituitary Adrenal- adrenaline, cortisol Pancreas- insulin Ovaries- estrogens, progesterone Testes- androgens Exception: Pheromones: act like hormones, but are airborne territorial markers (dogs) mate attractants (gypsy moths) ovulation synchrony Hormones are regulators secreted by glands that alter gene function in a target cell somewhere else in the body. Cortisol- fight or flight: 1. make glucose available (from non-carbs) 2. act on skeletal muscle (break down protein) 3. high dose suppress immune system a bit a. reallocation of resources to deal with stress b. chronic stress = mismatch with our novel environment Adrenaline:
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lecture13 - Life Science 15: Concepts and Issues Lecture...

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