AIIMS 2019 Biology Parturition MCQ Question
Assertion : Parturition is induced by neural signal in maternal pituitary.
Reason : At the end of the gestation period, the maternal pituitary releases prolactin which cause uterine contractions.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
Correct Answer
Detailed Explanation
Parturition is primarily regulated by the hormone estrogen, which plays a crucial role in preparing the uterus for labor by increasing the sensitivity of uterine muscles to oxytocin and promoting the expression of oxytocin receptors. While oxytocin (option B) is essential for stimulating uterine contractions during labor, it is the rise in estrogen levels that initiates the parturition process. Relaxin (option A) is involved in softening the cervix and pelvic ligaments, but it does not directly induce labor. Prolactin (option C) primarily regulates lactation and does not play a significant role in the childbirth process.
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