The menstrual cycle is regulated by a complex interplay of hormones, primarily estrogen and progesterone. The cycle can be divided into four phases:
Menstrual Phase: The shedding of the uterine lining, marked by menstruation. Follicular Phase: Follicle-stimulating hormone (FSH) stimulates the ovaries to produce follicles, each containing an egg. Ovulation: A surge in luteinizing hormone (LH) triggers the release of a mature egg from the ovary. Luteal Phase: The corpus luteum forms and secretes progesterone to prepare the uterine lining for potential pregnancy.
