Question

explain the exchange of gases in lungs with the help of a figure​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

The blood returning to the lungs through the pulmonary arteries has a venous PO2= 40 mm Hg and a PCO2= 45 mm Hg. The blood enters the lung capillaries where the process of exchanging gases between the capillaries and alveoli begins again (Figure 20.13). ... PO2 is higher in air than in the lungs.