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        Grades

        6-8

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        Auditory, Visual

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        Stream Only


        Part of WGBH
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        From the Heart

        This video segment describes how the chambers of the heart contract and relax in synchrony to push blood through the pulmonary and systemic loops of the circulatory system. You'll see how the heart pumps oxygen-depleted blood to the lungs, where red blood cells acquire oxygen before travelling back to the heart and then on to the rest of the body.

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