Describe how the changing level of …

The menstrual cycle is the reproductive cycle in a human female after puberty. The ovary releases one egg every month. The uterus also prepares itself every month to receive a fertilized egg. Various hormones are involved in controlling the cycle. The role of hormones is as follows:

1) Pituitary gland secretes Follicle Stimulating Hormone (FSH) which stimulates the development of follicle.

2) The follicle cells then secretes estrogen. Increase in the level of estrogen, stimulates the thickening of endometrium in the uterus. Also, it leads to the secretion of Luteinizing hormone (LH) by the pituitary gland which causes ovulation.

3) The level of LH increase and this is followed by increase in the secretion of progesterone and the follicles develop to form corpus luteum.

4) The corpus luteum then secrets high level of progesterone preparing the uterus for implantation. The high level of estrogen and progesterone decreases the level of FSH and LH.

5) In case no implantation occurs, levels of progesterone and estrogen decreases resulting in the breakdown of endometrium marking the beginning of menstruation.

8) After the menstruation begins, a level of FSH and LH again rises resulting in the beginning of new menstrual cycle.