Final answer:
The purpose of massaging the fundus of a postpartum client is to stimulate uterine contractions. Oxytocin released during labor causes contractions of the smooth muscles of the uterus, leading to the birth of the baby and stimulating milk ejection.
Step-by-step explanation:
The purpose of massaging the fundus of a postpartum client is to stimulate uterine contractions (d). During labor, the fetus exerts pressure on the uterine wall, which induces the production of oxytocin. Oxytocin stimulates the contraction of the smooth muscles of the uterus, leading to the birth of the baby. It also stimulates the contraction of myoepithelial cells around the milk-producing mammary glands, promoting milk ejection.