Extension Activities for Week 3: The Muscular System Tutorial: Zygote Body ZygoteBody™ is a 3D human anatomy tool for medical professionals, instructors and students to teach, study and learn about the human body. Video: The Muscular System - KidsHealth (5min) kidshealth.org/en/kids/msmovie.html Printable: Label the muscles kidshealth.org/en/kids/bfs-msactivity.html?WT.ac=k-ra Article: Your Muscles You have more than 600 muscles in your body! They do everything from pumping blood throughout your body to helping you lifting your heavy backpack. Find out more. Video: The Muscular System Bozeman Science (6min) YouTube for Kids. SafeShare is the perfect tool for sharing YouTube videos with kids in a safe environment.