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Unformatted text preview: each of the two lungs. Within the lungs, O 2 enters and CO 2 leaves the capillaries by diffusion. Oxygenated blood returns from the lungs to the left side of the heart. In the systemic circulation, oxygenated blood travels from the left side of the heart to the various areas of the body. Gas, nutrient, and waste exchange occurs across the capillary walls into the interstitial fluids outside the capillaries and then into the surrounding cells. The deoxygenated blood returns to the right side of the heart....
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- Spring '10