Difficulty: Medium
Average Score: 62%
Simulated
PaCO2 level indicates the effectiveness of:
Correct answer
D
Rationale
The correct answer is D: Lung ventilation. PaCO2 level indicates the partial pressure of carbon dioxide in the blood, reflecting how effectively the lungs are removing CO2. If the lungs are not ventilating properly, PaCO2 levels will rise, leading to respiratory acidosis. Kidney function (A) is more closely related to electrolyte balance and acid-base regulation, not PaCO2 levels. Bicarbonate buffers (B) and phosphate buffers (C) are involved in regulating blood pH but are not directly indicated by PaCO2 levels. Therefore, they are incorrect.