What is the primary physiological effect of nipple stimulation for labor induction?

The primary physiological effect of nipple stimulation for labor induction is the release of endogenous oxytocin. Oxytocin is a hormone produced by the hypothalamus and is released from the posterior pituitary gland. When the nipples are stimulated, sensory nerves convey this stimulation to the brain, subsequently leading to the release of oxytocin into the bloodstream.

This natural release of endogenous oxytocin helps to enhance uterine contractions and can promote the initiation of labor, making nipple stimulation a non-invasive method for labor induction. The role of oxytocin is crucial as it not only promotes uterine contractions but also supports maternal bonding and lactation postpartum.

While other options, such as the release of synthetic oxytocin, may pertain to labor induction, they refer specifically to medical interventions rather than the body's natural response. Similarly, the increase in blood volume and inhibition of prostaglandin release do not directly correlate with the physiological response induced by nipple stimulation.