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Do Now

Do Now. Name three organs of the female reproductive system Technical names only, please. The Menstrual Cycle. Section 38.1 Summary – pages 995-1004. The Menstrual Cycle.

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Do Now

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  1. Do Now • Name three organs of the female reproductive system • Technical names only, please.

  2. The Menstrual Cycle

  3. Section 38.1 Summary – pages 995-1004 The Menstrual Cycle • The series of changes in the female reproductive system that includes producing an egg and preparing the uterus for receiving it is known as the menstrual cycle. • The entire menstrual cycle repeats about once a month.

  4. Section 38.1 Summary – pages 995-1004 Oviduct The Menstrual Cycle Uterus • Once an egg has been released during ovulation, the part of the follicle that remains in the ovary develops into a structure called the corpus luteum. Egg released Ovary Follicle ruptures Corpus luteum Vagina Egg Follicle

  5. Section 38.1 Summary – pages 995-1004 Oviduct The Menstrual Cycle Uterus • The corpus luteum secretes the hormones estrogen and progesterone. Egg released Ovary Follicle ruptures Corpus luteum Vagina Egg Follicle

  6. Section 38.1 Summary – pages 995-1004 The Menstrual Cycle • Progesterone causes changes to occur in the lining of the uterus that prepare it for receiving a fertilized egg. • The menstrual cycle begins during puberty and continues for 30 to 40 years, until menopause. • At menopause, the female stops releasing eggs and the secretion of female hormones decreases.

  7. Section 38.1 Summary – pages 995-1004 The Menstrual Cycle • If the egg released at ovulation is not fertilized, the lining of the uterus is shed, causing some bleeding for a few days. • The entire menstrual cycle can be divided into three phases: the flow phase, the follicular phase, and the luteal phase.

  8. Section 38.1 Summary – pages 995-1004 LH Progesterone Estrogen Hormone levels FSH Follicle maturation Corpus luteum Ovulation Thickness of uterine lining Days Flow phase Flow phase Follicular phase Luteal phase Ovulation

  9. Section 38.1 Summary – pages 995-1004 The Menstrual Cycle • The timing of each phase of the menstrual cycle correlates with hormone output from the pituitary gland, changes in the ovary, and changes in the uterus.

  10. Section 38.1 Summary – pages 995-1004 Flow Phase • Day 1 of the menstrual cycle is the day menstrual flow begins. • Menstrual flow is the shedding of blood, tissue fluid, mucus, and epithelial cells that made up the lining of the uterus, the endometrium.

  11. Section 38.1 Summary – pages 995-1004 LH Progesterone Estrogen Hormone levels FSH Follicle maturation Corpus luteum Ovulation Thickness of uterine lining Days Flow phase Flow phase Follicular phase Luteal phase Ovulation

  12. Section 38.1 Summary – pages 995-1004 Flow Phase • This flow passes from the uterus through the cervix and the vagina to the outside of the body. • Contractions of the uterine muscle help expel the uterine lining and can cause discomfort in some females.

  13. Section 38.1 Summary – pages 995-1004 Flow Phase • During the flow phase, the level of FSH in the blood begins to rise, and another follicle in one of the ovaries begins to mature as meiosis of the prophase I cell proceeds.

  14. Section 38.1 Summary – pages 995-1004 Follicular Phase • The second phase of the menstrual cycle is more varied in length than the other phases. • In a 28-day cycle, it lasts from about day 6 to day 14. • As the follicle containing a primary oocyte continues to develop, it secretes estrogen, which stimulates the repair of the endometrial lining of the uterus.

  15. Section 38.1 Summary – pages 995-1004 LH Progesterone Estrogen Hormone levels FSH Follicle maturation Corpus luteum Ovulation Thickness of uterine lining Days Flow phase Flow phase Follicular phase Luteal phase Ovulation

  16. Section 38.1 Summary – pages 995-1004 Hypothalamus Releasing hormone Pituitary Hormone pathways to ovaries FSH LH Stimulation Inhibition Ovary Corpus luteum Growing follicle Increased estrogen at midcyle stimulates LH secretion, which leads to ovulation. After ovulation, increases in progesterone inhibit FSH, LH secretion. Progesterone, some estrogen Estrogen Ovulation

  17. Section 38.1 Summary – pages 995-1004 Follicular Phase LH Progesterone Estrogen Hormone levels FSH Corpus luteum Follicle maturation Ovulation Thickness of uterine lining Days Flow phase Flow phase Follicular phase Luteal phase Ovulation

  18. Section 38.1 Summary – pages 995-1004 Luteal Phase LH Progesterone Estrogen Hormone levels FSH Corpus luteum Follicle maturation Ovulation Thickness of uterine lining Days Flow phase Flow phase Follicular phase Luteal phase Ovulation

  19. Section 38.1 Summary – pages 995-1004 Luteal Phase • Progesterone increases the blood supply of the endometrium, causing it to accumulate lipids and tissue fluid. • These changes correspond to the arrival of a fertilized egg.

  20. Section 38.1 Summary – pages 995-1004 Luteal Phase Unfertilized egg • If the egg is not fertilized, the rising levels of progesterone and estrogen from the corpus luteum cause the hypothalamus to inhibit the release of FSH and LH. Ovulation Menstruation occurs

  21. Section 38.1 Summary – pages 995-1004 Luteal Phase Unfertilized egg • The corpus luteum degenerates and stops secreting progesterone or estrogen. Ovulation Menstruation occurs • As hormone levels drop, the thick lining of the uterus begins to shed.

  22. Section 38.1 Summary – pages 995-1004 Luteal Phase Fertilized egg • If fertilization occurs the endometrium begins secreting a fluid rich in nutrients for the embryo. Ovulation Embryo implants in uterine wall Menstruation does not occur

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