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← Nature & AnimalsWhich outcome is maximized by concurrent flow in bird respiratory system?
A)Oxygen extraction from air capillaries✓
B)Carbon dioxide buildup in air sacs
C)Body-heat dissipated into the bloodstream
D)Metabolic water generation from glucose
💡 Explanation
When pulmonary blood capillaries flow consistently meeting air across parabronchi forming loops allowing continuous oxygen exchange and concentration gradients across extended respiratory surface resulting in maximum exchange rate. Therefore oxygen extraction into the bloodstream is maximized, rather than CO2 build up of bird air sacs, heat, or water needing differing transport processes.
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