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Why do brids not have respiratory trouble at the time of flying at high altitude ?
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- Their lungs are very large
- They fly inactively
- They have extra air sacs
- They use less oxygen
- Their lungs are very large
Correct Option: C
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
