explain the exchange of gases in lungs with the help a figure
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Explanation:
The blood enters the lung capillaries where the process of exchanging gases between the capillaries and alveoli begins again (Figure 20.13). Figure 20.13. ... Blood travels from the lungs to the heart to body tissues, then back to the lungs, then the heart. PO2 is higher in air than in the lungs.
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