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Answer the Following Question. Explain the Following Phases in the Menstrual Cycle of a Human Female:: (I) Menstrual Phase (Ii) Follicular Phase (Iii) Luteal Phase - Biology

Answer in Brief

Answer the following question.
Explain the following phases in the menstrual cycle of a human female:
(i) Menstrual phase
(ii) Follicular phase
(iii) Luteal phase

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(i) Menstrual phase :

  • The soft tissue of the endometrial lining of the uterus disintegrates causing bleeding.
  • The unfertilized egg and soft tissues are discharged.
  • It lasts for 3-5 days.

(ii) Follicular phase/Proliferative Phase:

  • The primary follicles in the ovary grow and become a fully mature Graafian follicle.
  • The endometrium regenerates.
  • It lasts for about 10 to 14 days.

(iii) Luteal phase (15 days to 28/29 days):

  • In this phase the ruptured follicle changes into corpus luteum in the ovary and it begins to secrete hormone progesterone.
  • The endometrium thickens further.
  • If the ovum is not fertilized, the corpus luteum undergoes degeneration and this causes disintegration of endometrium leading to menstruation.
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