pregnancy

pregnancy - -only ~ 1/100th of eggs released in a lifetime...

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-only ~ 1/100 th of eggs released in a lifetime Usually only one egg matures and is released during each menstrual cycle After ovulation, remaining follicular tissue develops into corpus luteum -secretes estrogens and progesterone -maintenance of uterine lining in early pregnancy At ovulation, egg is released into abdominal cavity near opening of oviduct -ciliated opening of oviduct pulls egg in -cilia move egg through oviduct to uterus -endometrium highly vascularised lining of uterus Neck of uterus = cervix opens into vagina
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Vagina -thin walled, birth canal -repository for sperm during copulation Vaginal opening covered by hymen until ruptured Vagina and urethral openings housed in vestibule Clitoris at front end of vestibule structure similar to that of penis During sexual intercourse -Clitoris, vagina and labia engorge with blood and enlarge. -Barthlin’s gland secretes mucus into vestibule (provides lubrication for intercourse)
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Mammary glands -Breast -Not a component of reproductive system -Epithelial tissue that produces milk -Milk drains into thin ducts nipple Phases of the sexual response -Excitement -Plateau -Orgasm -Resolution 1) Excitement - preparation of vagina and penis for coitus -Vasocongestion filling of tissues with blood -Erection of penis and clitoris -Enlargement of testes, labia and breasts
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-Myotonia – increased muscle tension nipple erection and tension in arms and legs 2) Plateau -Breathing increases and heart rate increases -Not due to physical effort but due to stimulation of autonomic nervous System In females, vasocongestion of outer 1/3 of vagina and expansion of inner 2/3. -Uterus is elevated -Lead to a depression that collects sperm at back of vagina 3) Orgasm -Shortest phase of sexual response
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-Rhythmic involuntary contractions of reproductive structures -Contraction of abdominal muscles and anal sphincter Male orgasm -emission contraction of gland and ducts which force semen into urethra -ejaculation contraction of urethra and expulsion of semen Female orgasm -uterus and outer vagina contract 4) Resolution -Reverse the response of earlier stages -Reversal of vasocongestion -Muscles relax
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Spermatogenesis (46.12)
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This note was uploaded on 09/24/2011 for the course BIO 100 taught by Professor John during the Spring '11 term at Harvard.

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pregnancy - -only ~ 1/100th of eggs released in a lifetime...

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