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Human Reproduction — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Reproduction4 Marks
Question
Study the flow chart given below. Name the hormones involved at each stage and explain their functions.

Hypothalamus
$\downarrow$
Pituitary
$\downarrow$
Ovary
$\downarrow$
Pregnancy

 

✓

Answer

  1. Gonadotropin releasing hormone is released by the hypothalamus; it stimulates the pituitary to release follicle stimulating hormone (FSH) and luteinising hormone (LH), both of which act on the ovary.
  2. FSH stimulates the development of ovarian follicle into mature Graafian follicle and also secretion of estrogens by the follicle cells.
  3. LH stimulates ovulation, formation of corpus luteum from the ruptured follicle and secretion of progesterone by the corpus luteum.
  4. Progesterone is necessary to maintain the endometrium for implantation of the embryo and other events of pregnancy.

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