Visible Body

I came across this wonderful website called www.visiblebody.com. They have great 3D animation of human body's anatomy. This is what the site says about itself
"The Visible Body consists of highly detailed, anatomically accurate, 3D models of all human body systems. The models were developed by a highly trained team with decades of experience in medical illustration and biomedical visualization. All anatomical content has been reviewed for accuracy by our panel of experts, including physicians and anatomists. The beta release includes content covered in an undergraduate-level Anatomy and Physiology course. Years of modeling and enhancement make it the most sophisticated and complete 3D model of the human body available."

I dunno about the accuracy level, but its a great utility to explore the human body part by part and system by system. And the best part is it is completely free for registered users.
The only setback is I see is it works only on Internet Explorer that kinda unfairly excludes people who are using other operating systems. And it takes a little time to load for you to completely explore.
Also check out this wonderful site which has lots of animation videos on human body and its functions - http://www.argosymedical.com

ciao.....