~28-day hormonal cycle coordinating ovarian (follicular → ovulation → luteal) and endometrial phases. Driven by GnRH-FSH-LH with estrogen + progesterone feedback. Luteal regression → menses if no pregnancy.
~28-day hormonal cycle coordinating ovarian (follicular → ovulation → luteal) and endometrial phases. Driven by GnRH-FSH-LH with estrogen + progesterone feedback. Luteal regression → menses if no pregnancy.