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Lecture 19

Lecture 19 - • Corpus Luteum produces progesterone mainly...

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Lecture 19 Hormones: Puberty – male and female o Hypothalamus releases GnRH to the anterior pituitary in a pulsing manner. When the pulsing has reached the right rhythm it stimulates the anterior pituitary. This promotes the release of FSH [follicle stimulating hormone] and LH [leutinizing hormome] (hormones of reproduction) involved in maturation of ovaries and release of estrogen and progesterone FSH and LH signal change because the anterior pituitary is stimulated by the hypothalamus o At the end of menstrual period uterine lining thin FSH (from ant. Pit.) to ovary to stimulate follicle growth and produce estrogen Estrogen – eventually inhibits FSH by binding to receptor sites on the hypothalamus and thickens uterine lining which stimulates LH production LH with FSH causing ovulation and converts follicle to corpus luteum
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Unformatted text preview: • Corpus Luteum produces progesterone mainly but continues to secrete small amounts of estrogen o Progesterone completes and maintains uterine lining. In the absence of pregnancy progesterone inhibits LH When progesterone inhibits LH… • Corpus Luteum disintegrates • No progesterone produced • Uterine lining sloughs off • FHS no longer inhibited so a new cycle begins Birth Control Pills suppress FSH from the beginning so that no follicle ripens Not a lot of luteual scars suggests that a woman isn’t ovulating every month Fertility pills block estrogen receptor sites on the hypothalamus thereby preventing estrogen from shutting down FSH which allows follicles to ripen more and more If pregnancy occurs, the placenta releases hormomes that keep the corpus luteum from disintegrating o •...
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