09a reproductive hormones

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  • https://www.youtube.com/watch?v=nLmg4wSHdxQ (ovulation)
    https://www.youtube.com/watch?v=ovB0pjRXGsA (spermatogenesis)
  • 09a reproductive hormones

    1. 1. Reproductive Hormones gonadotropic hormones regulate gonad development (male and female)  produced in the pituitary; released upon hypothalamus signal 1. follicle stimulating hormone (FSH) 2. luteinizing hormone (LH)
    2. 2. Male Reproductive Hormones 1. androsterone 2. testosterone
    3. 3. Male Reproductive Hormones both hormones are released from testes
    4. 4. Testes Cells 1. Leydig interstitial cells synthesize hormones 2. Sertoli cells synthesize sperm
    5. 5. Male Gonad Development 1. hypothalamus secretes gonadotropin-releasing hormone (GnRH) 2. pituitary gland releases FSH & LH 3. FSH stimulates Sertoli cells to form sperm 4. LH stimulates Leydig cells to secrete testosterone
    6. 6. Role of Testosterone stimulates spermatogenesis (life time process) develops male characteristics at puberty increased secretion of body oils commonly associated to body odour
    7. 7. hypothalamus GnRH pituitary LH FSH testes Sertoli cells Leydig cells testosterone sperm production
    8. 8. Female Reproductive System 1. estrogen 2. progesterone
    9. 9. Female Reproductive System both hormones produced in the ovaries
    10. 10. Ovary Follicle Cells 1. primary oocyte fertilized by sperm 2. granulosa cells provide nutrients for primary oocyte
    11. 11. Female Reproductive System comparatively more complicated than male reproductive system monthly cycle until menopause (~12 to 50 yrs) one ovum produced per germ cell female hormones responsible for oogenesis and ovulation
    12. 12. Menstrual Cycle 1. menstruation (flow phase) sloughing of endometrial cells  no ovum fertilization  estrogen and progesterone levels low  1. follicular phase follicle maturation  estrogen secretion by granulosa cells 
    13. 13. Menstrual Cycle 3. ovulation  ovum leaves ovary  granulosa cells become corpus luteum  corpus luteum begins to secrete progesterone  estrogen levels decrease
    14. 14. Menstrual Cycle 4. luteal phase / secretory stage corpus luteum secretes progesterone & estrogen progesterone encourages endometrium development
    15. 15. Female Gonad Development  GnRH, FSH and LH involved 1. hypothalamus secretes gonadotropin-releasing hormone (GnRH) 2. pituitary gland releases FSH & LH 3. FSH matures follicle 4. LH causes ovulation and causes corpus luteum maturation
    16. 16. hypothalamus GnRH pituitary 1 LH FSH 2 ovaries follicle corpus luteum progesterone some estrogen ovulation estrogen
    17. 17. Menopause ovaries lose responsiveness to FSH and LH usually occurs between ages 46 and 54 most other mammals do not undergo menopause thought to allow human females to take care of grandchildren rather than continue to reproduce

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