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Unformatted text preview: Stretching of the uterus stimulates oxytocin secretion, which stimulates uterine contractions. The Newborn Respiratory and Circulatory Changes o Inflation of the lungs at birth results in closure of the foramen ovale and the ductus arteriosus. o When the umbilical cord is cut, blood no longer flows through the umbilical vessels. Digestive Changes o The newborn digestive system only gradually develops the ability to digest a variety of foods. Lactation Estrogens and progesterone help stimulate the growth of the breasts during pregnancy. Suckling stimulates prolactin and oxytocin synthesis. Prolactin stimulates milk production, and oxytocin stimulates milk "letdown."...
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- Fall '10