What does “Gas exchange” actually mean in Breathing & Exchange of Gases, and why does it matter for NEET?
oxygen and carbon dioxide swap by diffusion across the thin, moist walls of the alveoli.
In simple words: oxygen and carbon dioxide swap by diffusion across the thin, moist walls of the alveoli. Getting Gas exchange clear matters because NEET questions on Breathing & Exchange of Gases usually test this idea directly, not just a formula you memorised.
Key point
Gas exchange
Common mistake
thinking gases are actively pumped across the alveoli.
Memory tip
gas exchange is passive diffusion, driven by concentration differences.
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