Google Body is a detailed 3D model of the human body. You can peel back anatomical layers, zoom in, and navigate to parts that interest you. Click to identify anatomy, or search for muscles, organs, bones and more.
You can also share the exact scene you are viewing by copying and pasting the corresponding URL. In order for it to work you will need a web browser that supports WebGL, such as Google Chrome.
This is an amazing classroom resource from Google that should find a place in any science classroom or in any lesson where you are trying to teach young people (or adults) about the human body.