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

AHigh concentration of progesterone

BLow concentration of LH

CLow concentration of FSH

DHigh concentration of oestrogen

Answer:

Rising levels of estrogen from the growing follicle cause a positive feedback on the pituitary gland, leading to a surge in Luteinizing Hormone (LH).
This LH surge triggers the release of the ovum from the Graafian follicle (ovulation).
High concentration of progesterone is related to the luteal phase, not ovulation.
Low concentrations of LH or FSH do not trigger ovulation; rather, a surge or high level of LH is essential for ovulation.
Estrogen's high concentration indirectly causes ovulation by stimulating the LH surge.

So, the high level of estrogen is the key trigger that leads to the LH surge and subsequent ovulation.

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