Question
Biology Question on human reproduction
Which part of ovary in mammals acts as an endocrine gland after ovulation?
A
Stroma
B
Germinal epithelium
C
Vitelline membrane
D
Graafian follicle
Answer
Graafian follicle
Explanation
Solution
Release of ovum from the ovary is called ovulation. The Graafian follicle rises to the surface, sends out a protuberance or stigma and everts to release the ovum into peritoneal cavity. The empty Graafian follicle contains a blood clot which is called corpus haemorrhagic. Its granulosa cells continue to proliferate, develop yellow carotene pigment or lutein and get converted into lutein cells. This converts the ruptured follicle into yellow body called corpus luteum. It becomes a temporary endocrine gland secreting progesterone with small quantity of estrogen.