Q.

Which of the following is not the function of conducting part of respiratory system            [2022]

1 It clears inhaled air from foreign particles  
2 Inhaled air is humidified  
3 Temperature of inhaled air is brought to body temperature  
4 Provides surface for diffusion of O2 and CO2  

Ans.

(4)

Exchange or respiratory part of respiratory system is the site of actual diffusion of O2 and CO2 between blood and atmospheric air.