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Bill Nye the Science Guy - S02E03 Blood & Circulation

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http://www.sciencekids.co.nz/sciencefacts/humanbody/heart.html

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http://www.sciencekids.co.nz/sciencefacts/humanbody/blood.html

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https://www.quia.com/rr/30450.html

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Cardiac Conduction System and Understanding ECG

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How a Normal Heart Pumps Blood -- The Children's Hospital of Philadelphia

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Learn more at http://heart.chop.edu. In this animation, The Children's Hospital of Philadelphia explains how a normal heart pumps blood.

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Cardiovascular system Circulatory System Video -Human Body system video for kids

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Visit http://www.makemegenius.com for free educational videos for kids. Heart, Blood Circulation School Subject Video

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http://www.vtaide.com/png/blood-mcq.htm

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http://kidshealth.org/kid/htbw/_bfs_CSmoviesource.html

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http://kidshealth.org/kid/closet/movies/video_bldtest.html#cat20580

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http://www.mayoclinic.org/diseases-conditions/heart-disease/multimedia/circulatory-system/vid-20084745

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http://www.kscience.co.uk/animations/blood_system.swf

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http://activities.macmillanmh.com/science/ca/grade5/g5_ch3_ls4_ereview.html

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http://studyjams.scholastic.com/studyjams/jams/science/human-body/circulatory-system.htm