Heart and circulatory system The Heart and Circulatory System i-Doctum LITE presents the topic in an interesting and illustrative way. The 3D animations, graphics and pictures help students to understand phenomena like blood circulation or the structure of the heart more easily. With explaining the types and forms of cardiovascular diseases you can teach your students how to care about themselves and how to stay healthy and to avoid such sicknesses. Activities will help students to deepen their knowledge and practise what they have learned. The latest i-Doctum LITE material is suitable for introducing, teaching and presenting the topics of the blood and the circulatory system.