Question:
The pCO$_2$ of inspired air is ______________ mm Hg during external respiration.
The pCO$_2$ of inspired air is ______________ mm Hg during external respiration.
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pCO$_2$ of alveolar air is higher than that of inspired air.
Updated On: Mar 6, 2026
- 30
- 100
- 40
- 80
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The Correct Option is C
Solution and Explanation
Step 1: Understanding pCO$_2$.
pCO$_2$ refers to the partial pressure of carbon dioxide present in a gas mixture.
Step 2: Composition of inspired air.
Inspired atmospheric air contains a very low concentration of CO$_2$.
Step 3: Physiological value.
During external respiration, the pCO$_2$ of inspired air is approximately 40 mm Hg.
Step 4: Conclusion.
Hence, the correct answer is 40 mm Hg.
pCO$_2$ refers to the partial pressure of carbon dioxide present in a gas mixture.
Step 2: Composition of inspired air.
Inspired atmospheric air contains a very low concentration of CO$_2$.
Step 3: Physiological value.
During external respiration, the pCO$_2$ of inspired air is approximately 40 mm Hg.
Step 4: Conclusion.
Hence, the correct answer is 40 mm Hg.
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