What is meant by the ventilation/perfusion ratio?
a. the strength with which a person can blow a stream of air
b. a comparison of oxygen in the body with that in the heart
c. the comparison of alveolar ventilation to capillary perfusion
d. how quickly the oxygen taken in circulates once through the body
C
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A Incorrect. The ventilation/perfusion ratio is not the strength with which a person can blow a stream of air.
B Incorrect. The ventilation/perfusion ratio is not a comparison of oxygen in the body with that in the heart.
C Correct. The ventilation/perfusion ratio is the comparison of alveolar ventilation to capillary perfusion. This ratio becomes abnormal in the patient with pneumonia as the toxins released by pathogens and the by-products of the body's secondary and tertiary defenses both do damage to the pulmonary mucous membranes and cause the accumulation of debris and exudate in the airways.
D Incorrect. The ventilation/perfusion ratio is not how quickly the oxygen taken in circulates once through the body.
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