Resources for circulatory system

Hi all, Here are some resources on the human circulatory system.

 http://www.bbc.co.uk/schools/gcsebitesize/science/21c/keeping_healthy/heartdiseaserev2.shtml   http://kidshealth.org/kid/htbw/heart.html http://www.factmonster.com/dk/science/encyclopedia/circulatory-system.html

If you have other resources on the human circulatory system, feel free to post them up in the links so that all of us can learn from them too. Thank you! Cheers, Mrs Khan