What is the action of LH (luteinizing hormone) in females?

Luteinizing hormone (LH) plays a crucial role in the female reproductive system. Its primary action involves triggering ovulation and promoting the transformation of the ruptured follicle into the corpus luteum. After ovulation, the follicle that released the egg undergoes changes and becomes the corpus luteum, which produces hormones essential for preparing the uterus for a possible pregnancy. This transformation is vital because the corpus luteum secretes progesterone, which helps maintain the uterine lining.

Other options do not accurately capture the primary action of LH. Enlarging the graafian follicle is primarily the function of follicle-stimulating hormone (FSH), while stimulating the adrenal cortex is related to adrenocorticotropic hormone (ACTH) rather than LH. Breast development is influenced by hormones like estrogen and progesterone, which are not directly related to LH.