PSB-2000 Lecture Notes - Lecture 13: Hormonal Contraception, Ovulation, Anterior Pituitary
13 Oct 2017
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Fat-soluble; able to enter cells and bind to receptors. Progesterone prepares the uterus and breasts for pregnancy. All hormones present in both sexes, just in different amounts. Adult testes release more androgens and ovaries more estrogens. Sex hormones share a common pathway of synthesis. Activational : triggering reproduction-related behavior in mature individuals. Human critical period for genital formation is 3-4 months in utero. gonads beginning to form as either testes or ovaries, from gonads to exterior of body: wolffian or mullerian . Female is default pathway, no hormonal signal needed. Males need signal to override female plane. The hormone given to the adults that initiates a behavior causes activational effects. For activational effects, the brain must be appropriately organized during development. Testosterone during critical period masculinizes the hypothalamus of female. Males and females masculinized w t have larger . Humans similarly show differences in the . Some hormonal birth control acts by blocking the lh surge.
