Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 13 PCB MCQ (Single Correct)

In lactational amenorrhoea ovulation does not occur during the period of intense lactation due to

A
synthesis of oxytocin
B
high level of prolactin
C
presence of large amount of IgA in milk
D
increase in estrogen and progesterone ratio.

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The correct answer is:
B

In lactational amenorrhoea, ovulation does not occur during intense lactation because the suckling stimulus increases secretion of prolactin from the anterior pituitary. The high level of prolactin inhibits the release of GnRH from the hypothalamus, which in turn suppresses FSH and LH secretion, thereby preventing ovulation. Hence, the correct answer is high level of prolactin.

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