When explaining to a class of pregnant women why labor begins, the nurse will include the fact that there are several theories that have been proposed to explain why labor begins, although none have been proven scientifically. which idea is one of those theories?

Labor is a coordinated sequence of involuntary, intermittent uterine contractions. It is the series of events that expels the fetus and placenta out of the mother’s body. This is made possible by the presence of uterine contractions and abdominal pressure that push the fetus out during the expulsion period of delivery.