What role does LH play during the luteal phase?

During the luteal phase of the menstrual cycle, luteinizing hormone (LH) plays a crucial role in supporting the corpus luteum. After ovulation has occurred, LH continues to be secreted and is responsible for stimulating the corpus luteum to produce progesterone and estrogen. These hormones are essential for maintaining the uterine lining and creating a suitable environment for a potential embryo if fertilization occurs.

The maintenance of the corpus luteum by LH is critical, as it prevents the degradation of the corpus luteum, allowing it to sustain hormone production until either pregnancy is established or it breaks down if fertilization does not occur, leading to menstruation. This support ensures that the uterine lining remains thick and vascularized, which is vital for implantation and early pregnancy support.