Q. 4 D4.0( 71 Votes )
1)Female reproductive system undergoes some changes at puberty and those changes repeat at the interval of every 28 – 30 days. These repetitive changes are called as menstrual cycle.
2) Menstrual cycle is a natural process, controlled by four hormones. These four hormones are follicle stimulating hormone (FSH), luteinizing hormone (LH), estrogen and progesterone.
3) One of the several follicles in the ovary starts to develop along with the oocyte present in it, under the effect of follicle stimulating hormone. This developing follicle secretes estrogen.
4) Endometrium of the uterus starts to develop (during first cycle) or regenerate (during subsequent cycles) under the effect of estrogen. Developing follicle completes its development. It bursts under the effect of luteinizing hormone and oocyte is released. This is called as ovulation.
5) Remaining tissue of the burst follicle forms the corpus luteum.
Corpus luteum starts to secrete progesterone. Endometrial glands
secrete their secretion under the effect of progesterone.
Such endometrium is ready for implantation of embryo.
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