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bsci notes 6-16-08

bsci notes 6-16-08 - Puberty 1 Puberty is a developmental...

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6/16/08 Puberty 1.) Puberty is a developmental stage when the individual transforms from a sexually immature to a sexually mature individual. 2.) Puberty is marked by physiological, morphological, and behavioral changes. 3.) In lower animals, the estrous cycle marks puberty. a. During the estrous cycle, the female is more receptive to the male for copulation. b. Ovulation occurs during, or just after, the estrous cycle. Hence, copulation in these animals is coupled with fertilization. 4.) In humans, puberty is complex. Male 1.) Puberty in the human male involves: a. Activation of the hypothalamic-pituitary testicular axis, which has been dormant since birth. b. A maturation process in the hypothalamus that takes about 12 years to complete. c. Hypothalamic neurons begin to release GnRH in a pulsatile manner (every 90-120 mins.) i. GnRH stimulates the pituitary gland to release FSH and LH (the gonadotropins) also in a pulsatile manner. ii. LH stimulates interstitial (leydig) cells to release androgen. 1. The major androgen is testosterone. 2. Testosterone is released into the bloodstream a. 95% will be bound by sex steroid hormone binding proteins.
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