Explain the following phases in the menstrual cycle of a human female:
(1) Menstruation
(2) Follicular phase
(3) Luteal phase
Menstruation: Decreased progesterone causes the uterine lining to shed, leading to bleeding.
Follicular Phase: FSH promotes follicle growth, and rising estrogen thickens the uterine lining.
Luteal Phase: Following ovulation, the corpus luteum develops from the ruptured follicle. It secretes progesterone to sustain the uterine lining for potential implantation.