This clip is about female menstruation. It begins with two girls laughing and dissolves into a diagram of the uterus. A female voice over explains that a special lining of blood and tissue coat the walls of the uterus so it can nurture a fertilized egg. If a baby is not conceived then the lining is dispelled through the vagina in a process called menstruation. Cuts to a animation of an egg moving through the fallopian tubes from the ovary to the uterus. Then the lining of the uterus dissolves and flows out the vaginal canal and out of the body. This is also called a period.