What is the primary function of the milk ejection reflex?

The primary function of the milk ejection reflex, also known as the let-down reflex, is to facilitate the release of milk from the alveoli, where it is produced, into the ducts that transport it to the nipple. This reflex is triggered by the baby suckling at the breast, which stimulates nerve endings that send signals to the brain. In response, the brain releases the hormone oxytocin, causing the alveoli to contract and eject milk. This process is crucial for breastfeeding as it ensures that the baby can access milk effectively while feeding, thereby promoting nutrition and bonding.

Other options touch on related aspects of breastfeeding or feeding behavior but do not capture the primary physiological mechanism involved in the milk ejection reflex as precisely as the correct choice. For instance, stimulating the baby’s suckling is a precursor to the reflex, while preparing the mother's breast or increasing the baby's appetite relates to broader aspects of breastfeeding and infant nutrition, rather than the direct function of the reflex itself.