Exploring the Heart - The Circulatory System!

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Xuất bản 14/08/2015
Find out how the heart works, and how blood flows through your body! Learn more about your body here: http://www.aboutkidshealth.ca/En/JustForKids/Body/Pages/default.aspx
animation children blood Heart circulatory system blood cells oxygen veins arteries childrens health
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