Which one of following is most likely root cause why menstruation is not taking place in regularly c

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2.Human Reproduction

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Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?

Maintenance of the hypertrophical endometrial lining

Maintenance of high concentration of sex hormones in the blood stream

Retention of welldeveloped corpus luteum

Fertilisation of the ovum

(AIPMT-2009)

Solution

(b) : High concentration of sex steroids (estrogen) exerts negative feedback on anterior pituitary, decreasing $LH$ secretion and release thus, lowering $LH$ level in blood. Due to insufficient $LH$ – level no ovulation occurs which causes irregular menstruation.

Standard 12

Biology