Which of the following statements about bird respiration is false?
A. Air flowing through the air channels in the
lungs moves in the opposite direction of blood
flowing through the blood capillaries in the
lungs.
B. Oxygen is exchanged between the air and
the bloodstream in the lungs, but not in the air
sacs.
C. The unidirectional flow of air through a
bird's lungs maintains a larger concentration
gradient for diffusion than can be obtained
through tidal breathing.
D. Bird lungs receive fresh air during both
inhalation and exhalation.
E. It takes two ventilation cycles for a single
breath of air to move through a bird's
respiratory system.
A
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