Avian Respiratory System:
What is the function of the air sacs in the respiratory system of birds?
a) To allow mixing of fresh and stale air so that the oxygen/carbon dioxide ratio is optimal
b) To hold air before and after it passes through the lungs so that it moves in one direction
c) To provide a site for gas exchange between the blood and the surrounding air
d) To provide a storage site for holding fresh air that can be drawn from during periods of high metabolic demand.
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