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Progesterone is needed for the maintenance |
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a) |
Of ovary |
b) |
Of ovum |
|
c) |
Of endometrium wall |
d) |
Of ootid |
|
Progesterone is needed for the maintenance |
|||
|
a) |
Of ovary |
b) |
Of ovum |
|
c) |
Of endometrium wall |
d) |
Of ootid |
(c)
Progesterone hormone is the main hormone, which maintains the endometrium wall.
Generally, menstrual cycle have four phases
(i) Menstrual phase (a) The soft tissue of endometrial lining of the uterus disintegrates causing bleeding.
(b) The unfertilized egg and soft tissue are discharged.
(c) It lasts 3-5 days.
(ii) Follicular Phase/Proliferative Phase (a) The primary follicles in the ovary grow and become a fully mature Graafian follicle.
(b) The endometrium of the uterus is regenerated due to the secretion of LH and FSH from anterior pituitary and ovarian hormone, estrogen.
(c) It least for about 10-14 days.
(iii) Ovulatory Phase (a) Rapid secretion of LH (LH surge) induces rupture of Graafian follicle, thereby leading to ovulation (release of ovum).
(b) It lasts for only about 48 hr.
(iv) Luteal Phase/Secretor Phase (a) In this phase the ruptured follicle changes into corpus luteum in the ovary and it begins to secrete the hormone progesterone.
(b) The endometrium thickens further and their glands secrete a fluid into the uterus.
c) If ovum is not fertilized, the corpus luteum undergoes degeneration and this causes disintegration of the endometrium leading to menstruation