Question

During the menstrual cycle, if the oocyte is not fertilized, a number of events occur which are listed below. Select the answer that places the events in the correct chronological order.

Events:

1. the lining of the uterus is shed
2. the corpus luteum secretes progesterone
3. follicle cells are converted to the corpus luteum
4. the corpus luteum degenerates
5. estrogen and progesterone levels fall
6. ovulation occurs

6, 3, 2, 4, 5, 1

6, 4, 3, 2, 1, 5

1, 2, 3, 4, 5, 6

2, 4, 3, 1, 6, 5

Answer 1

Answer. 6,3,2,4,5,1

As ovulation occurs, graafian follicle is converted into the corpus luteum. It starts producing progesterone, in absence of sperms the corpus luteum degenerates. The endometrial lining of uterus is shed as estrogen and progesterone level drops down.