13. Puberty 08 - Puberty 'Puberty' 1894 Munch Puberty -...

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Unformatted text preview: Puberty 'Puberty' 1894 Munch Puberty - sexual maturation transition from sexually immature child to sexually mature adult puberty from Latin 'pubes" meaning hair varies with age, weight in humans, begins earlier in females than males in western Europe and USA, clear trend toward earlier puberty in girls and boys Females - human 1 st menstruation (menarche) 12 years (7 - 19 yr) 1 st ovulation then or as much as 2 yrs latter 1 st menarche can be anovulatory menarche and ovulation are steps in a series of changes development of 2 nd sex characteristics Secondary sex characteristics- Female uterus, oviducts and vagina grow and mature pelvis grows pubic and axillary hair breast development sweat and sebaceous glands increase activity decrease in voice increase in metabolic rate fat deposition especially in hips and breasts skeletal growth (usually ends about 16 years of age) Females Males Males - human /1 growth spurt and fat deposition 10-13 yr girls taller & more developed than same age boys later stimulation of growth due to increasing testosterone testes and secondary sex characteristics pubic hair and axilla, chest, facial and extremities sweat glands become active in scrotum, face, back and chest areola darkens and widens vocal cords double in length = dramatic deepening of voice Great Variation Among Individuals Males - human /2 scrotum, penis growth spontaneous erections increase in frequency occur in infants and fetuses nocturnal emissions/ejaculation Normal do not indicate abnormal behavior or physiology both spontaneous erections and nocturnal emissions decrease after puberty FSH/LH Children FSH & LH not elevated and no gonadal stimulation until puberty Boys Girls Neonatal Gn and Androgen however, FSH & LH can be at or near adult levels soon after birth and for first 2 years of life neonatal (0-5 months) boys have elevated T levels responsible for Leydig & Sertoli cell mitosis and future sperm count Hormones - Birth to Puberty Early Puberty 9-12 yrs = FSH then LH rise occurs in females 1 - 2 yrs earlier than males Prolactin rises in females but not males possibly due to rising estradiol Hormones - Birth to Puberty FSH & LH During puberty fluctuation in LH and FSH great role unknown dramatic rise at night daily cycle in not seen in adults or children from early to mid puberty dramatic rise in magnitude and frequency of LH surges sleep augmented LH secretion in late puberty daytime surges also increase, but still less than nighttime continues until adult-noncyclic-levels achieved Hormones - Birth to Puberty Testosterone /1 Testosterone rises in boys...
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This note was uploaded on 05/19/2011 for the course ZOO 4926 taught by Professor Staff during the Summer '08 term at University of Florida.

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13. Puberty 08 - Puberty 'Puberty' 1894 Munch Puberty -...

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