Which feature of the avian respiratory system permits largely one-way airflow through the lungs during the respiratory cycle?
Correct answer: B. Air sacs with parabronchi
- A. Large alveolar sacs
- B. Air sacs with parabronchi
- C. A muscular diaphragm
- D. A complete tracheal ring system
Explanation
Birds use air sacs as bellows to move air through rigid lungs containing parabronchi, allowing largely unidirectional airflow. Birds do not possess a mammalian-style muscular diaphragm or typical alveoli.
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Covers the gross and microscopic structure of domestic animals, including bones, joints, muscles, organs, blood vessels and nerves. It explains how the respiratory, cardiovascular, digestive, urinary, nervous, endocrine and reproductive systems function, with attention to species differences and the relationship between anatomical structure and physiological processes.
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