Question

Explain the following phases in the menstrual cycle of a human female: 
(1) Menstruation 
(2) Follicular phase 
(3) Luteal phase

Answer 1

Menstruation: The uterine lining sheds due to a drop in progesterone levels, resulting in menstrual bleeding. 
Follicular Phase: FSH stimulates the development of follicles, and estrogen levels increase, thickening the uterine lining. 
Luteal Phase: After ovulation, the ruptured follicle forms the corpus luteum, secreting progesterone to maintain the uterine lining for possible implantation.