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Answer : 3. "They have additional air sacs"
Why don't birds feel shortness of breath while flying at high altitudes?
5Q:
Why don't birds feel shortness of breath while flying at high altitudes?
- 1Their lungs are very largefalse
- 2They fly passivelyfalse
- 3They have additional air sacstrue
- 4They use less oxygenfalse
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Answer : 3. "They have additional air sacs"
Explanation :
Because flying takes a tremendous amount of energy, birds need to get lots of oxygen. The air sacs in their lungs help them to keep fresh air flowing in, unlike mammals, where the “old” air within the trachea and mouth (which has low oxygen content and high CO2 levels) in inhaled each time.