When both ovaries of rat are removed then which hormone is decreased in blood : -
A
Oxytocin
B
Prolactin
C
Estrogen
D
Gonadotrophic releasing factor
The answer is C.
Solution
The ovaries are the primary female sex organs and also endocrine glands. They secrete estrogen (by the growing follicles) and progesterone (by the corpus luteum). If both ovaries are removed (ovariectomy), these hormones are no longer produced, so the estrogen level in blood falls sharply. Oxytocin and prolactin come from the pituitary, and gonadotrophin releasing factor comes from the hypothalamus; GnRH and gonadotrophins actually rise when the ovaries are removed, because there is no negative feedback from estrogen. So estrogen is decreased in blood.
ConceptOvaries secrete estrogen
Chemical Coordination and Integration in past papers
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