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MENSTRUAL CYCLE
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SMALL AND EFFECTIVE CLASS 12 BIOLOGY NOTES ON MENSTRUAL CYCLE
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MENSTRUAL CYCLEMenstrual phase:
>) Menstrual flow occurs for 3-5 days.
>) It is because of breaking of endometrium lining
and blood vessels of uterus, which flows out in the
form of liquid from vagina.
Follicular phase :
>) Primary follicle becomes graffian follicle.
>) Endometrium regenerates.
>) Change (increase) in the level of hormones from
pituitary and ovary induces these changes.
>) Levels of LH and FSH increases gradually which
stimulates follicular development as well as
secretion of estrogen by growing follicles.
Ovulatory phase:
>) Peak level of LH and FSH attained during middle
of cycle (about 14th day), which is called LH surge.
It leads to rupture of graffian follicle and release of
ovum.
Luteal phase:
>) Remaining parts of graffian follicle gets
converted into corpus luteum. It secretes large
amount of progesterone essential for the
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