What is the main action of oxytocin?

Oxytocin primarily functions to stimulate uterine contractions, particularly during labor and childbirth. It is produced in the hypothalamus and released from the posterior pituitary gland. This hormone plays a crucial role in the childbirth process by enhancing the contractions of the uterine muscles, which facilitates the delivery of the baby.

Additionally, oxytocin has roles in lactation, as it triggers milk ejection during breastfeeding by contracting the myoepithelial cells surrounding the milk ducts. Its actions are vital for both reproductive processes and mother-infant bonding post-delivery.

While oxytocin has been studied for various effects, including potential impacts on social bonding and emotional regulation, its primary and most well-documented action in the context of physiology and labor is the stimulation of uterine contractions.