Question

Progesterone is secreted by
(a) Corpus luteum
(b) Thyroid
(c ) Thymus
(d) Testes

Answer 1

The ovum is shed from the ovary by the rupture of the follicle. The shedding of the ovum from a Graafian follicle is called ovulation. The remaining parts of the follicle form a structure which releases progesterone.

Complete answer:
Corpus Luteum is a yellow-colored body structure which is the remains of the Graafian Follicle after the release of the developing ovum. The cytoplasm of the corpus luteum is filled with a yellow pigment called lutein. The corpus luteum grows for a few days and if the ovum is fertilized and the pregnancy results, it continues to grow. It releases large amounts of progesterone. It is needed for the maintenance of endometrium, which is required for the implantation of the fertilized ovum and other events of pregnancy.

Additional Information:
-After the fertilization and implantation of the embryo in the endometrium of the uterus, the corpus luteum continues to secrete progesterone for 7-9 weeks. This hormone is essential for the continuity of blood supply and oxygen supply to the fetus. It also supports the uterine linings to become thick enough to surround the embryo.
-The thyroid gland is made up of two lobes that are situated on either side of the trachea. The follicle cells in the thyroid gland synthesize two hormones namely tetraiodothyronine or thyroxine and triiodothyronine.
-The male reproductive system consists of a pair of testis along with accessory ducts, glands, and external genitalia which are located in the pelvis region of the body.
-Thymus is a primary lymphoid organ concerned with the production of T-Lymphocytes. These are immune cells that coordinate an attack against any foreign antigen.

So, the correct answer is ‘Corpus luteum.’

Note: -The hormones of the thyroid gland play a very crucial role in the regulation of basal metabolic rate (BMR). Thyroid hormones are also responsible for the maintenance of water and electrolyte balance.