Question

Draw a diagram to explain the interaction of hormones in the menstrual cycle in human females.

Answer 1

LH. The hormone LH causes the mature egg to be released from the ovary. This image shows how the level of oestrogen changes during the menstrual cycle. Progesterone is another hormone secreted by ovaries: it maintains the lining of the uterus and stays high during pregnancy.

Answer 2

Menstrual cycle in human females is controlled by a group of hormones. At first, LH (leutinising hormone) and FSH (follicle stimulating hormone ) are released from the pituitary gland of the brain. It helps in ovulation and stimulates the ovaries to produce progesterone and estrogen . These hormones prepare the body for fertilization.

A menstrual cycle includes 3 steps:

• Follicular phase (before the eggs are released)
• ovulatory phase (egg release)
• leutal phase ( after the egg is released)      

During the follicular phase the level of estrogen and progestone hormomes is low, due to which bleeding occurs and at now, the level of follicular stimulating hormone increases. It leads to development of follicles in ovary and as its level decreases, only a single follicle continues to develop and releases estrogen.

In ovulatory phase, the level of LH and FSH rise in level. Leutinizing hormone stimulates the release of egg. The  level of estrogen is at peak and progestrone starts increasing.

In leutal phase, the Leutinizing hormone and  follicle stimulating hormone level decreases. The ruptured follicle releases ovum and forms corpus luteum that helps in production of prgestrone. If the eggs are not fertilized they are degraded and the the level of progestron decreases. The level of progestrone and estrogen led to thicking of uterine wall for the next menstrual cycle.