Animal reproduction - The interplay of tropic and sex hormones regulates mammalian reproduction - The reproductive cycles of females

4 important questions on Animal reproduction - The interplay of tropic and sex hormones regulates mammalian reproduction - The reproductive cycles of females

What happens if a pregnancy does not occur?

The uterine lining is sloughed off and another cycle begins.

What two closely linked reproductive cycles are there in human females?

  • Menstrual or uterine cycle
  • Ovarian cycle

Explain the steps of the ovarian cycle

  1. Hypothalamus releases GnRH
  2. GnRH stimulates anterior pituitary to secrete small amounts of FSH and LH.
  3. FSH and LH stimulate follicle growth.
  4. The cells of growing follicle start producing estradiol
  5. Estradiol secreted by growing follicle begins to rise steeply
  6. FSH and LH levels increase markedly
  7. Final maturation of the follicle, ovulation
  8. Start lutual phase, because of LH stimulation follicular tissue develops into corpus luteum and secretes progesterone and estradiol.
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What is the probable function of menopause?

After giving birth to several children it provides the mother with the ability to provide better care of her children and grandchildren, thereby improving their chances of survival and reproduction.

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