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Question

(a) What is the fate of the Graafian follicle after ovulation?                                                     
(b) What are the functions of the hormones in the follicular phase of the menstrual cycle? [5 marks]


Solution

(a) After ovulation, the remaining part of the Graafian follicle transforms into the corpus luteum. [½ mark]

Corpus luteum secretes large amounts of progesterone. [½ mark]
Progestrone helps in the maintenance of the endometrium. [½ mark]
Maintenance of endometrium is important for implantation of the fertilised egg during pregnancy. [½ mark]
In case the released egg is not fertilised, the corpus luteum degenerates. [½ mark]


(b) The following hormones are secreted during the follicular phase of the menstrual cycle:
  1. i) FSH (Follicular Stimulating Hormone): FSH stimulates follicular development. [½ mark]
  2. It stimulates the secretion of estrogens by the growing follicles. [½ mark]
  3. ii) LH (Luteinizing hormone): LH helps in the follicular development. [½ mark]
  4. The rapid increase in the level of LH called as LH surge induces rupture of Graafian follicle and thereby ovulation. [½ mark]
  5. (iii) Oestrogen: It stimulates the proliferation of the endometrium. [½ mark]

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