Which Statement About Respiration in Birds and Mammals Is True

question 109

Multiple Choice

Which statement about respiration in birds and mammals is true?

• A) Ventilation in bird lungs is bidirectional, but ventilation in mammal lungs is tidal.
• B) Mammals have less dead space in their lungs than do birds.
• C) Because of the efficiency of their respiratory systems, we would expect to see birds, but not mammals, at very high altitudes.
• D) Air sacs are present in the respiratory systems of birds and some mammals.
• E) A single breath of air remains in a mammal's respiratory system for one inhale and one exhale and in a bird's respiratory system for three cycles of inhalation and exhalation.

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