Which hormone maintains the endometrium for pregnancy?

The hormone that maintains the endometrium for pregnancy is progesterone. After ovulation, the corpus luteum produces progesterone, which plays a crucial role in preparing the endometrium to receive a fertilized egg. Progesterone helps thicken the lining of the uterus, stabilizing it and preventing it from shedding, which would otherwise occur during the menstrual cycle. This thickened state is essential for implantation and support of the developing embryo.

In the absence of progesterone, the endometrial lining would not be maintained, leading to menstruation. This hormone's primary role is therefore to ensure that a suitable environment exists for a potential pregnancy.