Yes it is
in female after the ovulation corpus luteum is formed
if after ovulation the ovum meet with sperm and if fertilisation occur then corpus luteum give progesterone which is pregnancy hormone
if fertilisation does not occur then corpus luteum give estrogen which continues menstrual cycle

The Corpus Luteum as a Temporary Endocrine Gland

The corpus luteum is indeed a temporary endocrine gland that forms in the ovary after the release of an egg during ovulation. It plays a crucial role in the menstrual cycle and early pregnancy. Let's delve into the details of the corpus luteum and its functions.

Formation and Structure

- The corpus luteum develops from the remnants of the ovarian follicle that housed the mature egg during its growth and maturation.
- After the egg is released, the empty follicle undergoes a transformation and turns into a structure called the corpus luteum.
- The corpus luteum consists of granulosa and theca cells, which were previously part of the follicle.
- These cells produce and secrete various hormones that are vital for the maintenance of the uterine lining and preparation for potential pregnancy.

Hormonal Functions

- The corpus luteum primarily produces two essential hormones: progesterone and estrogen.
- Progesterone is responsible for preparing the uterus for potential implantation of a fertilized egg.
- It helps thicken the uterine lining (endometrium) and prepares it to receive the embryo.
- Progesterone also inhibits the contraction of the uterine muscles, preventing premature contractions that could lead to the expulsion of the developing embryo.
- Estrogen, another hormone produced by the corpus luteum, further supports the growth and maintenance of the endometrium.

Duration and Regression

- The corpus luteum has a finite lifespan and typically lasts for about 10 to 14 days if fertilization does not occur.
- If fertilization and implantation occur, the corpus luteum is maintained by a hormone called human chorionic gonadotropin (hCG) secreted by the developing embryo.
- This hormone sustains the corpus luteum, allowing it to continue producing progesterone and estrogen until the placenta takes over hormone production.
- However, if fertilization does not occur, the corpus luteum undergoes a process called luteolysis, where it regresses and shrinks in size.
- As luteolysis occurs, the production of progesterone and estrogen decreases, leading to the shedding of the uterine lining during menstruation.

Conclusion

In summary, the corpus luteum is a temporary endocrine gland that forms after ovulation. It produces vital hormones such as progesterone and estrogen, which are crucial for the preparation and maintenance of the uterine lining. If fertilization and pregnancy occur, the corpus luteum is sustained by hCG until the placenta takes over hormone production. However, if fertilization does not occur, the corpus luteum regresses, leading to the shedding of the uterine lining during menstruation.