What are "labor contractions"?

What are "labor contractions"?

“Labour contractions” are the tightening of the uterine muscle. The uterus' sole purpose is to house a pregnancy and then contract around that pregnancy to force it through the vagina. In a “term pregnancy”--beyond 37 weeks--you won't stop regular labour contractions. Because it's a big muscle made up of millions of muscle cells the uterus doesn't necessarily contract uniformly, initially. It may start sporadically all over the place with irregularity, but eventually it becomes regular labour contractions to push that baby out.