Normal diffusion of CO2 at rest: (A) 20-25 ml/min, (B) 50-100 ml/min, (C) 100-200 ml/min, (D) 400-500 ml/min
Answer is D. Normal diffusion capacity of co2 is about 400 to 500 ml per minute Ref: guyton and hall textbook of medical physiology 12 edition page number:350,351,352