Explania is one of my favorite resources for animated explanations of topics in technology and science. Some of their offerings are videos and some of their offerings are interactive animations. One of their interactive animations that could be quite useful for biology teachers and health teachers is The Human Heart. The Human Heart animation allows visitors to learn about the parts and functions of the human heart by clicking on different parts of the heart to find short explanations of that part's function. Your students can access the interactive animation on the Explania website or you can embed the animation into your blog or website.
The Human Heart - Explania