GK
HUMAN BODY AND REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Initial stage of birth is result of stimuli from the
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fetal pituitary
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mother’s pituitary
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decrease in level of progesterone
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all of these
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Explanation:
Detailed explanation-1: -The pituitary gland generally undergoes an increase in size during pregnancy, which is mainly due to an increase in blood supply, as it is a highly vascular organ. Some of the volume increase may also occur as a result of estrogen-mediated hyperprolactinemia caused by lactotroph hyperplasia.
Detailed explanation-2: -The fetal hypothalamus-pituitary-adrenal (HPA) axis is at the center of mechanisms controlling fetal readiness for birth, survival after birth and, in several species, determination of the timing of birth.
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