Sexuality Chapter 5 - Menstrual Cycle

Sexuality Chapter 5 - Menstrual Cycle - Chapter 5 Menstrual...

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Chapter 5 Menstrual Cycle
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The menstrual cycle is regulated by levels of sex hormones. These changes cause a change in the ovaries and the uterus. Differences between menstrual cycles and estrus: 1) Estrus cycles do not produce menstration (able to get pregnant in animals) 2) The timing of ovulation is different in the two cycles. Estrus (the spotting) occurs when she is fertal, and in Menstration (the spotting in humans) means she is not fertal. 3) Animals who has estrus will only have sex when they are in heat.
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Phases of the Menstrual Cycle: Phase 1) Follicular Phase: a) Pituitary gland secrets high levels of FSH b) This signals the folical to mature one egg. c) The folicle is also secreting estrigen. (help the cells and tissues in the female body get ready for pregnancy) Phase 2) Ovulation: a) Estrigen level surpasses FSH (higher) so this causes FSH to go back to a low leve. b) High estrigen causes the hypothalamus to
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c) GNRH signals the pituitary glad to make LH d) this increase in LH causes ovulation. Progesteron: prepairs the lining of the uterus for the furtilized egg. Maintains the pregnancy, helps it stay viable. Estrigen: helps the egg mature. Peaks right before ovulation, and at its lowest right before you menstrate. Phase 3) Luteal Phase a) The follicle becomes a massive cells called the corpus luteum. b)the Corpus Luteum makes progesterone.
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c) High levels of progesterone inhibit the LH levels. d) Low levels of LH cause the corpus leutum to dissinigrate. e) when it dissinigrates you then have low levels of estrigen and progesterone. f)
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This note was uploaded on 10/15/2011 for the course PSY 2311 taught by Professor Staff during the Spring '08 term at Texas State.

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Sexuality Chapter 5 - Menstrual Cycle - Chapter 5 Menstrual...

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