Question

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

• A. High concentration of progesterone
• B. Low concentration of LH
• C. Low concentration of FSH
• D. High concentration of oestrogen

Answer 1

Answer:

D. High concentration of oestrogen

• 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.