Which of the following hormone levels will cause release of ovum (ovulation) from the graffian folli

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Question

Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?

Accepted Answer

Correct Answer: D — High concentration of EstrogenSolution:As the Graafian follicle matures, it secretes increasing amounts of estrogen. When estrogen levels reach a peak (positive feedback), it triggers a surge in LH (Luteinizing Hormone) from the anterior pituitary. This LH surge is the direct trigger for ovulation — the rupture of the Graafian follicle and release of the secondary oocyte. Thus, high estrogen concentration initiates the cascade leading to ovulation.Why other options are incorrect:A. High progesterone is secreted after ovulation by the corpus luteum; it prepares the endometrium for implantation and inhibits further ovulation.B. Low LH would not trigger ovulation; it is the LH surge (high LH) that causes follicle rupture.C. Low FSH would lead to inadequate follicle development, not ovulation.Key Concept: Hormonal events of the menstrual cycle: Follicular phase — FSH stimulates follicle development → rising estrogen → positive feedback on LH → LH surge (14th day) → Ovulation. Luteal phase — LH converts ruptured follicle into corpus luteum → corpus luteum secretes progesterone + estrogen → endometrium maintained for implantation.

Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?

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Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?

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