The Respiratory System of Birds Differs from That of Most

question 30

Multiple Choice

The respiratory system of birds differs from that of most other reptiles.All of the following statements regarding gas exchange in birds vs.other reptiles are true except one.

• A)Lungs of birds are comprised of tiny air tubes called parabronchi that facilitate a one-way movement of air through the lungs.In other reptiles (except possibly crocodilians), air flows in and out of respiratory passageways by reversing direction.
• B)Birds have thoracic and abdominal air sacs that help move air through the respiratory system.No other reptiles have these air sacs.
• C)Birds have more dead air regions in their lungs in comparison to most other reptiles, with the possible exception of the crocodilians.
• D)During expiration, air can be moving into the gas exchange surfaces of a bird's lungs.During expiration, air is always moving out of the gas exchange surfaces of other reptiles (with the possible exception of crocodilians).

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