BIO CALCULATING LUNG VOLUME IN HUMANS. In humans, oxygen and carbon dioxide are exchanged in the blood within many small sacs called alveoli in the lungs. Alveoli provide a large surface area for gas exchange. Recent careful measurements show that the total number of alveoli in a typical pair of lungs is about 480 × 106 and that the average volume of a single alveolus is 4.2 × 106 μm3. (The volume of a sphere is
1.92 What is total volume of the gas-exchanging region of the lungs? (a) 2000 μm3; (b) 2 m3; (c) 2.0 L; (d) 120 L.
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