Physiology Respiratory system 142451ec 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 High-Yield Explanation 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