When calculating the alveolar volume (the volume of air that contributes to gas exchange in the lungs), what is subtracted from the tidal volume?
1. The dead space
2. The respiratory rate
3. Minute ventilation
4. The PaCO2
The dead space
Rationale: The tidal volume minus the anatomic dead space equals the alveolar volume. The alveolar volume is the volume of air that contributes to gas exchange in the lungs. The alveolar volume decreases in diseases such as chronic bronchitis and COPD.
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