tiny sacs of lung tissue specialized for the movement of gases between air and blood.
A. lungs
B. bronchi
C. alveoli
D. capillaries
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What is incorrect about gas exchange?
A. Alveolar air is rich in oxygen and poor in carbon dioxide
B. Gas exchange takes place by diffusion
C. Blood that reaches the capillaries surrounding the alveoli is rich in oxygen and poor in carbon dioxide
D. Oxygen diffuses from the alveoli into the red blood cells in the capillaries and carbon dioxide diffuses into the alveoli
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