Slide 1

Gas Exchange in Lungs Prof. K. Sivapalan Slide 2 Properties of Gases 20132Gas Exchange Slide 3 Water Vapor Pressure 20133Gas Exchange Slide 4 Diffusion of Gases in Liquids 20134Gas Exchange Slide 5 Diffusion of Different Gases 20135 Oxygen1.0 Carbon Dioxide20.3 Carbon Monoxide0.81 Nitrogen0.53 Helium0.95 Gas Exchange Slide 6 Partial Pressures 20136Gas Exchange Slide 7 Oxygen and Carbon dioxide in Expired air 20137Gas Exchange Slide 8 Alveolar Gas Concentration 20138Gas Exchange Slide 9 Respiratory Unit 20139Gas Exchange Slide 10 Respiratory Membrane A layer of fluid lining the alveolus Alveolar epithelium Epithelial basement membrane Interstitium Capillary basement membrane Capillary endothelium Plasma and red cell 0.6 , 70 M 2, 60 140 ml of blood 201310Gas Exchange Slide 11 201311 Diffusing Capacity Gas Exchange Slide 12 Partial Pressure Difference across respiratory membrane 201312Gas Exchange Slide 13 Factors Affecting Gas Exchange 201313Gas Exchange