Same chapter3 marksDifficulty: Medium
How is an alveolus adapted for gaseous exchange?
The Respiratory System
3 marksDifficulty: Medium
State three differences between inspired and expired air.
Original Khojo Papers practice question — not from a past board paper.
Answer
Inspired air contains about 21% oxygen against about 16% in expired air, and about 0.04% carbon dioxide against about 4%. Expired air is also warmer and saturated with water vapour, and contains more dust and bacteria.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The nitrogen content is practically unchanged.
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