Which sequence correctly describes the neurohormonal reflex by which infant suckling leads to milk production and milk ejection?

• A. Infant suckling → nipple mechanoreceptors send afferent signals to the hypothalamus → hypothalamus modulates pituitary hormone release → increased prolactin for production and increased oxytocin for ejection.
• B. Infant suckling → stimulation of taste receptors in the mouth → activation of posterior pituitary stores of prolactin and oxytocin which are immediately released to produce and eject milk.
• C. Infant suckling → release of gastrointestinal hormones that act on the pancreas which then signals the hypothalamus to suppress prolactin and raise oxytocin levels inducing milk ejection but reducing production.
• D. Infant suckling → chemoreceptors in the gut signal the medulla oblongata → medulla directly secretes prolactin and oxytocin into systemic circulation causing production and ejection of milk.

Answer: (A)