![]() ![]() This is because the uterus is hormonally regulated, and the hormone that primarily causes labor contractions - oxytocin - is also released when someone orgasms, or during the cramping some people experience during their period. In labor, contractions are quite strong, but people actually have contractions at other times in life too. This self-sustaining process is called the Ferguson reflex. As labor progresses, a feedback loop is created in which oxytocin is released, a contraction occurs, the contraction squeezes the uterus and the fetus, creating more pressure on the cervix, which in turn signals the release of more oxytocin, and the cycle repeats itself. The interaction causes the muscles fibers to twitch, or squeeze.
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