Question

What will be the pO₂ and pCO₂ in the atmospheric air compared to those in the alveolar air?

(i) pO₂ lesser, pCO₂ higher

(ii) pO₂ higher, pCO₂ lesser 

(iii) pO₂ higher, pCO₂ higher 

(iv) pO₂ lesser, pCO₂ lesser

Answer 1

(ii) pO₂ higher will create the pressure gradient to facilitate the movement of O₂ from atmosphere to alveoli and pCO_{​​​​​​​2} lesser will create the movement of CO_{​​​​​​​2} from alveoli to atmosphere.