What changes occur at the time of birth ?

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asked Jan 11 in Class X Science by aditya23 (-855 points)

What changes occur at the time of birth ?

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answered Jan 11 by priya12 (-11,409 points)

A cycle of uterine contractions followed by labour pains, dilation of cervix and the vagina slowly pushes the foetus out of the uterus. The uterine contractions are initiated by decreased progesterone secretion and the secretion of oxytocin hormone by the pituitary gland. After the child delivery, the placenta is expelled out.

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