Question

Explain different phases of menstrual cycle , highlighting the role of ovarian ,pitutitary hormone , changes in endometrium and changes in graffian follicle

Answer 1

MENSTRUAL PHASE: 3-5 days
Endometrium breaks down menstruation begins. The cells of endometrium, secretions, blood and the unfertilized ovum constitute the menstrual flow, progesterone production is reduced.
FOLLICULAR PHASE (proliferative phase): 6-13
Endometrium rebuilds, FSH & LH secretions increases that stimulates follicular development as well as secretion of oestrogen.
OVULATORY PHASE : 14 day
Both LH & FSH attain a peak level. Ovulation occurs.
LUTEAL PHASE (Secretory phase) : 15-28days
Corpus luteum secretes progesterone. Endometrium thickens and uterine glands become Secretory.

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Answer 2

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With the start of a menstrual cycle, pituitary produces FSH hormone which stimulates the ovaries to start the formation and maturation of eggs. With the maturation of these follicles, estrogen level rises in the body indicating the formation of the mature egg. This leads to the completion of the follicular phase. The pituitary gland now produces LH hormone which causes the release of an egg from ovary by the process of ovulation. After ovulation, luteal phase begins during which the level of progesterone in the body starts increasing. Progesterone hormone maintains the lining of the wall of the uterus for pregnancy. If pregnancy does not take place then progesterone level falls and menstrual flow begins.