There are a lot of apps that teach about the body's many systems. Some very good. But, this is the first app I have run across that actually has activities that kids can do to get some real hands-on learning experience. And, hands-on REALLY gives kids an understanding that pictures and text can never get across! Plus, most of the activities can be done with what you already probably have around the house.
In addition to the activities, the app shows visual details on the systems, with information of what they are, as well as educational videos.
Lawrence Hall of Science puts out some really nice apps, and this is just another. And it's FREE!
Compatible with iPhone, iPad, and iPod touch.