An area of the lung has no blood flow but is normally ventilated. Which of the following state-ments are true about this area?
1. The alveolar gas is like air (PO2 = 150; PCO2 = 0).
2. The area represents alveolar dead space.
3. The / is elevated.
a. 1 and 2 only
b. 1 and 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: D
At the extreme right of the graph, perfusion is 0 (/ = 0). Areas with ventilation but no blood flow represent alveolar dead space, as defined in Chapter 10. The makeup of gases in these areas is similar to that of inspired air (PO2 = 150 mm Hg; PCO2 = 0 mm Hg).
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