My Incredible Body is an iPad app (currently free) designed to help students learn how the human body works. The app features eight sections. Those sections are circulation, muscles, senses (vision, smell, hearing, touch), kidneys & urine, skeleton, respiration, digestion, and brain & nerves. Each section of the app contains short animated videos that explain the functions of each system and how it works.
Students can work through My Incredible Body in any order they choose. The content of the videos that I watched in My Incredible Body are appropriate for middle school students, but would be too basic for high school students.