This unit discusses the gas and blood circulation systems

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This video discusses the mechanics of getting oxygen into the body and carbon dioxide out.
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Red blood cells

by Sal Khan

This video is a continuation of the Lungs and Pulmonary System video and discusses red blood cells.
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This video is a continuation of the Red Blood Cell video and discusses the circulatory system and the heart.
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Hemoglobin

by Sal Khan

This video discusses hemoglobin in detail.
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