What layer of the uterus contracts to expel menstrual fluid and push the fetus out of the womb during labor?

Question

Quizplus · Accepted Answer

The myometrium is the middle layer of the uterus composed of smooth muscle that contracts during menstruation to expel menstrual fluid and during labor to push the fetus out of the womb. The perimetrium is the outermost layer of the uterus, while the endometrium is the innermost layer that thickens each month in preparation for implantation of a fertilized egg. The perineum is the area between the vaginal opening and the anus, and is not a layer of the uterus.

What Layer of the Uterus Contracts to Expel Menstrual Fluid