01:119:116 Lecture Notes - Lecture 14: Parathyroid Gland, Adrenal Medulla, Adrenal Gland
23 Oct 2018
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Document Summary
Endocrine glands" function in regulating homeostasis, development and behavior. Ca2+ homeostasis also under hormonal control by thyroid gland: if ca2+ above set point, thyroid gland releases calcitonin, calcitonin inhibits bone breakdown; enhances excess ca2+ excretion by kidneys. Sex hormones affect growth, development, reproductive cycles, and sexual behavior. Adrenal glands secrete small quantities but gonads are primary source. 3 major classes: androgens, primarily synthesized in testes, testosterone is main androgen; promotes primary male reproductive structures before birth, at puberty, testosterone responsible for male"s secondary sexual characteristics. Dna makeup: several mechanisms exist, budding (yeasts, grow a bud and cytokinesis plops it off :d, fission, one organism that splits into 2 equal organisms, pathenogenesis, occurs when females produce offspring without the. If animals can reproduce without gamete fusion, why sex? need for sperm. No boys mmmhm: there is a (cid:498)two-fold(cid:499) cost to sex, fig 46. 3. In asexual reproduction, each individual makes 2 progeny.
