What does ventilation-perfusion coupling refer to?
A. The air flow to the lung must be greater than the blood flow to the lung.
B. The air flow to the lung must be less than the blood flow to the lung.
C. The air flow to the lung must match the blood flow to the lung.
D. The air flow to the lung must be greater than or less than but not equal to the blood flow to the lung.
Answer: C
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