4. Breathing and Exchange of Gases question bank (Zoology)

Partial pressures (in mm Hg) of oxygen and carbon dioxide at different parts involved in diffusion in comparison to those in atmosphere is given in the following tables. Identify the correct one:

Option 1:  
O₂ → 159 (Atmospheric air), 40 (Alveoli), 40 (Blood Deoxygenated), 95 (Blood Oxygenated), 40 (Tissue)  
CO₂ → 0.3, 104, 45, 40, 45  

Option 2:  
O₂ → 159, 104, 40, 95, 45  
CO₂ → 0.3, 40, 45, 40, 45  

Option 3:  
O₂ → 159, 104, 40, 95, 40  
CO₂ → 0.3, 40, 45, 40, 45  

Option 4:  
O₂ → 159, 40, 45, 40, 40  
CO₂ → 0.9, 104, 40, 40, 45

Given below is a diagram of section of an alveolus with a pulmonary capillary. Find out the correct diagram: