Question

Which hormone is mainly secreted by corpus luteum
(a) Thyroxine
(b) Progesterone
(c) HCG
(d) Estrogen

Answer 1

Hint: Pregnancy hormone secreted to maintain endometrial lining before and after the pregnancy. It is secreted by the simulation of the pituitary gland. It is one of the important hormones secreted by the female during the menstrual cycle and after pregnancy.

Complete answer:
The gonadal organs present in the female body are called ovaries located in the abdominal cavity. Estrogen is released by the ovary. After ovulation, the ruptured follicle becomes a yellow body called corpus luteum. This acts as a temporary endocrine gland and secretes a hormone called Progesterone.

Additional Information: 

-The release of the ovum from the ovary is called ovulation. The ovum is released from the ruptured follicle called Graafian follicle.
-The ovum released from the Graafian follicle is not fully matured.
- After ovulation, the granulosa cells in the Graafian follicle proliferate and are transformed into a yellow glandular mass called corpus luteum. This acts as a temporary endocrine gland. During this period it releases a hormone called progesterone which is essential for maintaining the uterine endometrium.
-This endometrium is essential for the implantation of blastocyst-stage and other events involved in the pregnancy.
-Progesterone helps in the inhibition of contraction of the uterus. It also stimulates the formation of alveoli in the mammary glands and secretion of milk.
- If there is no fertilization, the corpus luteum loses its function and degenerates into a whitish body called corpus Albicans.
-Due to the absence of Progesterone secreted by the corpus luteum, the disintegration of the endometrium occurs leading to menstruation. 

So, the correct answer is ‘Progesterone’.

Note: 

> If fertilization takes place, along with the corpus luteum endometrial wall also secretes progesterone for maintaining the endometrial lining
> Estrogen is also an important androgen secreted by the ovaries for the formation of ovules.
> Progesterone is also known as the pregnancy hormone.