Learn all about the circulatory system with new, precise, yet easy-to-understand, definitions and explanations.  What is the function of the circulatory system?  What parts of the body make up the circulatory system?  What are the parts of the heart and their function within the circulatory system?  What are the types of blood vessels and their functions?  And lastly, what is blood and its function?  The answers to all of these questions are covered in depth with detailed graphics, diagrams and exciting video.  On-screen, multiple-choice reviews at the end of each segment reinforce important concepts and make learning fun.