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Luteinizing hormone (LH) plays a crucial role in the female reproductive system, particularly in the menstrual cycle and reproductive functions. Its primary function is to trigger ovulation, which is the release of an egg from the ovary. This process is essential for reproduction as it allows the opportunity for fertilization.

In addition to triggering ovulation, LH also stimulates the ovarian follicles to produce hormones such as estrogen and progesterone. After ovulation, the ruptured follicle transforms into the corpus luteum, which produces these hormones that are vital for maintaining the early stages of pregnancy and regulating the menstrual cycle. The secretion of estrogen and progesterone also prepares the uterus for potential implantation of a fertilized egg.

Therefore, LH is integral to the regulation of the menstrual cycle and fertility, making its role in triggering ovulation and the secretion of these hormones the primary focus of its function in the female reproductive system.