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(B) Doctors inject the hormone $Oxytocin$ to stimulate strong contractions of the uterine wall during childbirth.$Parturition$:$(i)$ The average durat

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Oxytocin

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(B) Doctors inject the hormone $Oxytocin$ to stimulate strong contractions of the uterine wall during childbirth.$Parturition$:$(i)$ The average duration of human pregnancy is about $9$ months,which is known as the gestation period.$(ii)$ The process of expelling the fully developed fetus from the mother's uterus at the end of the gestation period is called parturition.$(iii)$ It is induced by a complex neuroendocrine mechanism.$(iv)$ Signals for parturition originate from the fully developed fetus and the placenta,which induce mild uterine contractions known as the fetal ejection reflex.$(v)$ This reflex triggers the release of $Oxytocin$ from the maternal pituitary gland.$(vi)$ $Oxytocin$ acts on the uterine muscle and causes stronger uterine contractions.$(vii)$ $Relaxin$ increases the flexibility of the pubic symphysis and ligaments,which helps to dilate the uterine cervix during labor.$(viii)$ This process ultimately leads to the expulsion of the baby.

The hormone injected by doctors to induce delivery is:

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