ANATOMY

Heart & Lungs

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Heart

The picture below shows how blood flows through the heart.
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Left Lung

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Alveoli

The lungs contain millions of tiny alveoli. This is where the gas exchange of oxygen and carbon dioxide happens.
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Inside an Alveoli

Here it shows that oxygen goes into the red blood cells through alveoli, then Carbon Dioxide goes from the red blood cells into alveoli and breathed out.
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