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Both birds and mammals have, but birds can fly at high altitudes where oxygen levels are low.
How might their respiratory system be adapted to help them survive in such conditions?
Research and present your findings.
How might their respiratory system be adapted to help them survive in such conditions?
Research and present your findings.
Show sample answer
Key Points
Birds have a highly efficient respiratory system that extracts more oxygen per breath than mammals can.
Key Adaptations
- Air sacs: Birds have a system of air sacs (like extra chambers) connected to the lungs. These store air and push it through the lungs in one continuous flow.
- One-way airflow: In mammals, air goes in and out the same way — so used air mixes with fresh air. In birds, fresh air flows through the lungs in one direction only — giving more oxygen per breath.
- More efficient gas exchange: Because fresh air is always flowing through, birds extract more oxygen even when it is thin at high altitudes.
- Example: Bar-headed geese fly over the Himalayas at altitudes where oxygen is very low — their efficient respiratory system makes this possible.
Birds extract oxygen more efficiently than mammals because fresh air flows through their lungs continuously — this is how they fly at high altitudes with little oxygen.
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