For the High School Biology and Anatomy teachers, these next few sites may help out with visualizing how the human body works from the inside.
Healthline Body Maps provides interactive three dimensional models for learning about human anatomy. Body Maps has male and female models. The models have eight layer views, from skin to skeletal, that you can select.
BioDigital Human offers interactive 3D models of human anatomy. You can turn on and off different views according to which body systems you want to view. The models can be rotated 360 degrees and the labels have an audio play-back option. If you are going to use BioDigital Human in your classroom, there are two things to keep in mind. First, the models are 100% anatomically correct. Second, you do need to have your browser updated to the latest version possible to experience all that BioDigital Human has to offer.
In Sponge Lab's Biology Build a Body students construct a human body system-by-system. To build a body students drag and drop into place the organs and bones of a human body. Each organ and bone is accompanied by a description of the purpose of that bone or organ.
Anatomy Arcade is a collection of games about human body systems. The collection is categorized by both body system and game type.
Get Body Smart has number of tutorials and quizzes divided into eight categories of anatomy and physiology. Each category is divided into subcategories where visitors will find quizzes for each topic. The tutorials and quizzes are best suited to use in advanced high school anatomy and physiology courses.