1
Question
Given below is a flow chart showing ovarian changes during menstrual cycle. Fill in the spaces giving the name of the hormones responsible for the events shown.
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Solution
Role of FSH and LH :
Anterior pituitary plays a role in the development of primary follicles into the Graafian follicles. In the follicular phase, the primary follicle in the ovary grows and becomes the Graafian follicle, these changes are induced by LH (luteinizing hormone) and FSH (follicle stimulating hormone) hormones.
Hence ‘a’ is LH and FSH.
Final answer: LH and FSH
Ovulation:
Ovulation is the release of secondary oocytes from the Graffian follicle.
- LH (luteinizing hormone) and FSH (follicle stimulating hormone) attain a peak level in the middle of the menstrual cycle (around the 14th day).
- Rapid secretion of LH leads to LH surge.
- LH surge induces the rupture of Graffian follicle and the release of the secondary oocyte. Hence ‘b’ is luteinizing hormone (LH).
Final answer: LH
Corpus luteum:
After the release of the secondary oocyte from the Graafian follicle under the influence of LH, the ruptured graafian follicles change into corpus luteum or the yellow body.
Corpus luteum releases hormone progesterone which plays a role in the development of the endometrium of the uterus to maintain pregnancy. If fertilization occurs corpus luteum is maintained and in the absence of fertilization it regresses into corpus albicans or the white body. Hence ‘c’ is LH.
Final answer: LH
Anterior pituitary plays a role in the development of primary follicles into the Graafian follicles. In the follicular phase, the primary follicle in the ovary grows and becomes the Graafian follicle, these changes are induced by LH (luteinizing hormone) and FSH (follicle stimulating hormone) hormones.
Hence ‘a’ is LH and FSH.
Final answer: LH and FSH
Ovulation:
Ovulation is the release of secondary oocytes from the Graffian follicle.
- LH (luteinizing hormone) and FSH (follicle stimulating hormone) attain a peak level in the middle of the menstrual cycle (around the 14th day).
- Rapid secretion of LH leads to LH surge.
- LH surge induces the rupture of Graffian follicle and the release of the secondary oocyte. Hence ‘b’ is luteinizing hormone (LH).
Final answer: LH
Corpus luteum:
After the release of the secondary oocyte from the Graafian follicle under the influence of LH, the ruptured graafian follicles change into corpus luteum or the yellow body.
Corpus luteum releases hormone progesterone which plays a role in the development of the endometrium of the uterus to maintain pregnancy. If fertilization occurs corpus luteum is maintained and in the absence of fertilization it regresses into corpus albicans or the white body. Hence ‘c’ is LH.
Final answer: LH
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