What happens to gas exchange when the Va/Q ratio approaches infinity?
APartial pressure of O2 becomes negligible.
BNo exchange of O2 and CO2 occurs.
CPartial pressure of CO2 becomes negligible.
DPartial pressures of both CO2 and O2 remain normal.
Which condition is primarily responsible for the decrease in arterial PO2 in patients with chronic obstructive pulmonary disease (COPD)?
ACO poisoning
BShock
CCyanide poisoning
DVentilation-perfusion mismatch
Which of the following is not true about ventilation-perfusion ratio (V/Q)?
ALow V/Q in shunt
BHigh V/Q in dead space
CV/Q is highest at lung base
DNormal V/Q is approximately 0.8
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