menstrualcycle-ch.6

menstrualcycle-ch.6 - Chapter 6 Menstruation and Menopause...

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Chapter 6 Menstruation and Menopause
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Biology and the Menstrual Cycle Menstrual cycle is regulated by fluctuating levels of sex hormones. These hormones produce certain changes in the ovaries and uterus. Humans are nearly unique among species in having a menstrual cycle. Other species of mammals have estrous cycles.
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The Phases of the Menstrual Cycle The menstrual cycle has 4 phases: 1 . Follicular phase - proliferative or preovulatory phase. 2. Ovulation 3. Luteal phase - secretory or postovulatory phase. 4. Menstruation
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What Happens in the Ovaries During the Menstrual Cycle Follicular phase - high levels of FSH secreted. Function is to stimulate follicles in the ovaries. One follicle begins to ripen and brings an egg to maturity. Follicle secretes estrogen. Ovulation - follicle ruptures open and releases the ripened egg.
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What Happens in the Ovaries During the Menstrual Cycle Luteal phase - after releasing an egg, the follicle turns into the corpus luteum and manufactures progesterone. Menstruation - shedding of the inner lining of the uterus.
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What Happens in the Uterus During the Menstrual Cycle Follicular phase - high levels of estrogen stimulate the endometrium. Luteal phase - progesterone secreted by the corpus luteum stimulates the glands of the endometrium to start secreting nourishing substances.
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What Happens in the Uterus During the Menstrual Cycle
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menstrualcycle-ch.6 - Chapter 6 Menstruation and Menopause...

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