Why can the corpus luteum degenerate when placenta is fully formed?

The corpus luteum is a temporary endocrine gland that forms in the ovary after ovulation. It secretes progesterone, which is essential for maintaining the pregnancy. The placenta is another endocrine gland that forms during pregnancy. It also secretes progesterone, as well as other hormones that are necessary for the growth and development of the fetus.

As the placenta grows, it becomes increasingly able to produce its own progesterone. This means that the corpus luteum is no longer needed to produce progesterone, and it will eventually degenerate. This usually happens around 10-12 weeks of pregnancy.

The degeneration of the corpus luteum is a natural process that does not harm the pregnancy. In fact, it is necessary for the pregnancy to continue. If the corpus luteum did not degenerate, it would continue to produce progesterone, which could lead to complications such as miscarriage or premature labor.