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Chemical Coordination and Integration · Question 73

AIPMT 2002MCQEasy📈 Topic in 12% papers+4−1
1

When both ovaries are removed from rat then which hormone is decreased in blood?

  1. Oxytocin
  2. Prolactin
  3. Estrogen
  4. Gonadotropin releasing factor

Answer

(3) Estrogen

Solution

As per NCERT, the ovary produces two groups of steroid hormones — estrogen (from growing ovarian follicles) and progesterone (from the corpus luteum).

∵ Oxytocin and prolactin come from the pituitary and GnRH from the hypothalamus, they are not reduced by ovariectomy (GnRH may even rise due to loss of negative feedback),

∴ removal of both ovaries decreases estrogen in the blood.

Answer: (3)

AIPMT 2002

Keep practising — Chemical Coordination and Integration

2

Melatonin is secreted by

  1. pineal body
  2. skin
  3. pituitary gland
  4. thyroid
AIPMT 2000
3

MSH is secreted by

  1. anterior lobe of pituitary
  2. middle lobe of pituitary
  3. posterior lobe of pituitary
  4. endostyle
AIPMT 2000

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