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Ovulation and Menstruation

Ovulation and Menstruation. Function of Menstrual Cycle. Uterine walls thickens with rich blood supply in preparation for a fertilized egg If fertilization does not occur the walls break down and the cycle repeats again. Stages of Menstruation. Stage 1 – Follicular Phase

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Ovulation and Menstruation

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  1. Ovulation and Menstruation

  2. Function of Menstrual Cycle • Uterine walls thickens with rich blood supply in preparation for a fertilized egg • If fertilization does not occur the walls break down and the cycle repeats again

  3. Stages of Menstruation • Stage 1 – Follicular Phase • Stage 2 – Ovulation • Stage 3 – Luteal Phase • Stage 4 – Menstruation

  4. Follicular Phase • Pituitary gland in the brain released two hormones • Follicle stimulating hormone (FSH) • Luteinizing hormone (LH) • Follicle in ovary begins to develop and release estrogen • Increased estrogen levels stimulates lining of uterus to thicken

  5. Ovulation • High level of estrogen causes pituitary gland to release a rush of LH • When LH level peaks it causes the follicle to rupture and release an egg cell

  6. Luteal Phase • Broken follicle forms a yellow colored structure called the corpus luteum • Corpus luteum releases the hormones estrogen and progesterone that helps to stimulate further growth of the uterine lining

  7. Menstruation • If an egg is not fertilized the corpus luteum breaks down • Less estrogen and progesterone is released and the lining of the uterus breaks down • Low levels of estrogen stimulate the release of FSH and LH from the pituitary gland and the cycle begins again

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