The Bohr equation applies to ventilation–perfusion ratios that have which of the following characteristics?
A. having a ventilation–perfusion value of zero
B. having perfusion in excess of ventilation
C. having ventilation in excess of perfusion
D. having a ventilation–perfusion value of ?
?ANS: D
A. Incorrect response: Alveoli having a ventilation–perfusion value of zero are defined as capillary shunt units.
B. Incorrect response: Alveoli characterized as having perfusion in excess of ventilation are called low ventilation–perfusion units.
C. Incorrect response: Alveoli experiencing ventilation in excess of perfusion are defined as high ventilation–perfusion units.
D. Correct response: Alveoli having a ventilation–perfusion value of ∞ are defined as alveolar dead space units.
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