What is a primary function of oxytocin in the human body?

Oxytocin primarily functions in the human body as a hormone that plays a crucial role in childbirth by causing uterine contractions. During labor, the release of oxytocin stimulates the muscles of the uterus to contract, facilitating the process of delivery. Additionally, oxytocin is important in the postpartum period as it helps with the milk ejection reflex during breastfeeding. While it has other roles in social bonding and emotional regulation, its primary and well-known function relates to its involvement in reproductive physiology, particularly in labor and lactation. This hormonal action is foundational to the birthing process and maternal care, making it vital in human reproduction.