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The Circulatory System

Inside your body there’s a bustling highway with your beating heart at the center. Learn all about your body’s 60,000 miles of microscopic blood vessels, 5 to 6 quarts of blood, and the sundry passengers (lymph, blood cells, nutrients and more) that ride it every day.

Related Topics: Respiratory System, Immune System, Lymphatic System, Nervous System

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