http://kidshealth.org/kid/htbw/DSquiz.html
http://kitses.com/animation/swfs/digestion.swf
http://www.sheppardsoftware.com/health/anatomy/digestion/digestion_tutorial.htm
http://www.cyh.com/HealthTopics/HealthTopicDetailsKids.aspx?p=335&np=152&id=2727
http://www.softschools.com/science/human_body/digestive_system/
http://nature.ca/discover/exm/blddgstvsystm/index_e.cfm
videos
The respiratory system
Blood circulation
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