300
The hormone oxytocin stimulates and enhances labor contractions. As the baby moves toward the birth canal, pressure receptors send messages to the brain to produce more oxytocin. Oxytocin travels to the uterus through the bloodstream, stimulating the muscles in the uterine wall to contract stronger (increase of ideal normal value). The contractions intensify and increase until the baby is outside the birth canal. When the stimulus to the pressure receptors ends, oxytocin production stops and labor contractions cease. This positive feedback mechanism is controlled by what system.
What is the endocrine system.