Final answer:
Oxytocin is secreted and released into the bloodstream to stimulate the milk ejection reflex in breastfeeding. It also plays a role in parent-newborn bonding and feelings of love.
Step-by-step explanation:
Oxytocin is necessary for the milk ejection reflex (commonly referred to as "let-down") in breastfeeding people. As the newborn begins suckling, sensory receptors in the nipples transmit signals to the hypothalamus. In response, oxytocin is secreted and released into the bloodstream. Within seconds, cells in the milk ducts contract, ejecting milk into the infant's mouth.
Additionally, oxytocin is thought to contribute to parent-newborn bonding and feelings of love and closeness. It is also involved in the sexual response.