CAS AN 263 Lecture Notes - Lecture 12: Anterior Pituitary, Cortisol, Underarm Hair
18 Mar 2018
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Document Summary
Male hormonal functioning: testosterone levels fall, hypothalamus stimulates anterior pituitary to produce fsh & lh, fsh promotes spermatogenesis, lh promotes production of testosterone in interstitial cells. Differences between males and females in reproductive ecology. No effect on testosterone of small changes in nutrition and energy expenditure. Large effect on ovarian hormones from small changes in nutrition and energy expenditure. Large changes cause decrease in testosterone levels and sperm quality. Sperm quality shut down only under very severe conditions. Lower testosterone causes less investment in muscle mass. Between populations: energetically stressed populations have lower testosterone levels less investment in body size. Even small energetic changes can cause a decrease in the probability of conception. Between populations: energetically stressed populations have lower ovarian hormones may result in longer inter-birth intervals. Testosterone responsive to changes in behavior/social circumstances: higher male rank in chimpanzees correlated with higher testosterone levels, differences in the culture of aggression (seen in south = american culture of honor)
