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
(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.
Video Tutorials For All Subjects
- Menstrual Cycle