The hormone responsible for parturition is:

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(A) Parturition is the process of giving birth to a baby. It is induced by a complex neuroendocrine mechanism. The signals for parturition originate f

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Estrogen

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(A) Parturition is the process of giving birth to a baby. It is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully developed fetus and the placenta,which induce mild uterine contractions called the fetal ejection reflex. This triggers the release of oxytocin from the maternal pituitary. Oxytocin acts on the uterine muscle and causes stronger uterine contractions,which in turn stimulates further secretion of oxytocin. The stimulatory reflex between the uterine contraction and oxytocin secretion continues,resulting in stronger and stronger contractions. This leads to the expulsion of the baby out of the uterus through the birth canal. While oxytocin is the primary hormone,estrogen also plays a role in increasing the sensitivity of the uterus to oxytocin. However,among the given options,the question refers to the hormonal control of labor. Since oxytocin is not listed,and estrogen is involved in the preparation for labor,it is the most appropriate answer in this context.

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