Multiple Choice
A high PO2 gradient is maintained in bird lungs because
A) the lungs have a large amount of dead space.
B) stale air does not mix with fresh air.
C) the lungs are exceptionally large.
D) the lungs are never completely emptied during an exhalation.
E) the air sacs provide additional surface area for gas exchange.
Correct Answer:
Verified
Correct Answer:
Verified
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