heart info. http://sln.fi.edu/biosci/biosci.html
map of the circulatory system http://www.proteacher.com/cgi-bin/outsidesite.cgi?id=8564&external=http://www.pbs.org/wgbh/nova/heart/&original=http://www.proteacher.com/110074.shtml&title=Cut%20to%20the%20Heart
veins http://library.thinkquest.org/5777/cir1.htm
more heart info. http://kidshealth.org/kid/htbw/heart.html
the path of the blood http://www.hometrainingtools.com/articles/blood-circulatory-system-science-teaching-tip.html
space shuttle http://www.spaceflight1.nasa.gov.
heart facts http://www.pbs.org/wgbh/nova/eheart/facts.html
inside the respiratory system http://lung.ca/children/grades4_6/index.html
respiratory system http://kidshealth.org/kid/htbw/htbw_main_page.html
bones http://yucky.discovery.com/noflash/body/pg000124.html
the skeleton http://www.kidport.com/RefLib/Science/HumanBody/BodyBones.htm
bone games http://tcm.childrensmuseum.org/special_exhibits/bones/kids_mazeGame.htm
skeleton quest http://www.sad34.net/webquests/SkeletonQuest/
muscular system http://yucky.discovery.com/flash/body/pg000123.html
muscles http://library.thinkquest.org/5777/mus2.htm