Why do women get periods? In this BrainPOP movie, Cassie and Rita fill you in on all the different stages of a woman’s menstrual cycle. You’ll learn about the ovaries and the thousands of eggs they contain, how the changing hormones in a girl’s body prompt one of these eggs to become mature every 28 days. You’ll also find out what ovulation is, and how the lining of the uterus contributes to a woman’s period. If you’ve been wondering how periods work - whether you’re just curious or too shy to ask - this is the movie for you!

Watch the Health movie about Period »