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. http://www.innerbody.com/anim/blood.html http://biology.about.com/library/organs/heart/blcapillary.htm http://kidshealth.org/kid/htbw/heart.html http://library.thinkquest.org/5777/cir1.htm http://www.fi.edu/learn/heart/systems/circulation.html http://www.globalclassroom.org/hemo.html