Female Reproductive System

Female Reproductive System - The Female Reproductive system...

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The Female Reproductive system Assigned reading: pages 1088-1097 in Saladin 5th
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ANATOMY OF OVARY Ovarian cortex is filled with follicles surrounding future egg- cells Follicles secrete estrogens, progesterone, inhibin, and a small amount of androgen GnRH FSH estrogens progesterone inhibin androgen
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HORMONAL CHANGES OF PUBERTY Thelarche Menarch 12 yrs Pubarche 8-10 yrs Rising levels of GnRH and effectors onset of breast development duct and lobule formation adipose and fibrous tissue complete breast enlargement by age 20 menarche - first menstrual period requires at least 17% body fat first few menstrual cycles are anovulatory (no egg ovulated) Onset of puberty appearance of pubic and axillary hair, sebaceous glands (stimulated by androgens from ovaries and adrenal cortex) l e p t i n
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MAJOR HORMONES OF PUBERTY estrogens (estradiol) stimulates growth and development of ovaries, stimulates GH secretion increase in height and widening of the pelvis, fat deposition progesterone primarily acts on the uterus preparing it for possible pregnancy in the second half of the menstrual cycle; limited function during puberty suppresses FSH & LH secretion
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CLIMACTERIC AND MENOPAUSE Climacteric: midlife change in hormone secretion accompanied by menopause : cessation of menstruation Female born with about 2 million eggs climacteric begins when there are about 1000 left less estrogen and progesterone secretion uterus, vagina, and breast atrophy bone mass declines producing increased risk for osteoporosis hot flashes – spreading sense of heat from the abdomen to the thorax, neck, and face blood vessels constrict and dilate in response to shifting hormone balances (maybe) Hormone replacement therapy: low doses of estrogen and progesterone to relieve some of these symptoms
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OOGENESIS oogenesis – egg production produces haploid gametes by means of meiosis
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This note was uploaded on 11/04/2011 for the course BIOL 252 taught by Professor Johnson during the Fall '07 term at UNC.

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Female Reproductive System - The Female Reproductive system...

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