Multiple choice general knowledge

Why do birds not have respiratory trouble at the time of flying at high altitude?

  1. Their lungs are very large

  2. They fly inactively

  3. They have extra air sacs

  4. They use less oxygen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Birds possess a unique respiratory system with air sacs that allow unidirectional airflow through lungs, enabling highly efficient oxygen extraction even at high altitudes where oxygen is thin. This system is more efficient than mammalian lungs, compensating for low oxygen pressure without requiring larger lungs or reduced oxygen usage.

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