chapter 8 - 9/15/2009 Adolescence Puberty Characterized by...

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9/15/2009 1 Adolescence Puberty Characterized by onset of hormonal effects Typical age = 9‐11 years Precocious puberty = before 8 in girls, 9 in boys Delayed puberty = no signs by 14 in boys, 13 in girls (physical changes) or no menarche by age 16 Primary and secondary sex characteristics Puberty Obvious physical changes ‐ In rough chronological order: Boys: Pubic hair, growth of sex organs, first ejaculation, growth spurt, voice change, facial hair Girls: Onset of breast growth, pubic hair, growth spurt, widening of hips, menarche Mostly complete 3‐4 years after onset Small amount of physical growth continues
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9/15/2009 2 Hormones Hypothalamus Pituitary gland adrenal Pituitary GnRH: Gonadotropin‐releasing hormone to gonads GH: growth hormones to adrenal glands Sex hormones GnRH influences gonads to release sex hormones Progesterone Boys: Testosterone (some estrogen) Feedback loop to hypothalamus and pituitary controls production of GH and GnRH Effects of hormones Physical growth, hair growth, etc. Menarche in girls, spermatogenesis in boys Emotional effects rapid arousal of emotions (testosterone) rapid shifting of emotions sexual arousal, sexual thoughts mood changes during menses Not all emotional changes due to hormones Variety of activities throughout the day in class, with friends, at home, at part‐time job, etc.
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9/15/2009 3 Menarche Between 9 and 17 years of age Genes determine in part age of onset
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This note was uploaded on 05/16/2011 for the course DEP 2004 taught by Professor Staff during the Spring '08 term at University of Central Florida.

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chapter 8 - 9/15/2009 Adolescence Puberty Characterized by...

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