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UPSC-CMS 2014 — Physiology

Q: Oxytocin is not responsible for:

Milk production. ***Milk production*** - **Oxytocin** is primarily responsible for the **ejection of milk** from the mammary glands, not its production. - **Prolactin** is the hormone chiefly responsible for **milk synthesis** or production. *Uterine involution* - **Oxytocin** plays a crucial role in **uterine contractions** postpartum, which helps the uterus return to its normal size (involution). - These contractions compress blood vessels, reducing **postpartum hemorrhage**. *After pains* - The contractions stimulated by **oxytocin** after childbirth, essential for uterine involution, are often perceived as **'after pains'**. - These pains are more pronounced in **multiparas** and breastfeeding women due to vigorous oxytocin release. *Milk ejection* - **Oxytocin** causes the contraction of **myoepithelial cells** surrounding the alveoli in the mammary glands. - This contraction leads to the **'let-down reflex,'** forcing milk into the ducts and outward through the nipple. [Practice more Physiology PYQs on OnCourse]

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Oxytocin is not responsible for: