Determine the Rate of Diffusion (Cm3/min or ML/min) in the Gas-Exchange

question 77

Multiple Choice

Determine the rate of diffusion (cm3/min or mL/min) in the gas-exchange organ of an air-breathing animal where the area for gas exchange in the lung is 2 cm2, the diffusion constant is 0.08 cm2/min, the PO2 (partial pressure of oxygen) of the air in the lung is 140 mm Hg, the PO2 in blood flowing into the lung is 90 mm Hg, and the thickness of the gas exchange membrane is 0.0001 cm.

• A) 80,000
• B) 125
• C) 32,000
• D) 10,00,000

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