Question

Which of the following is not the function of the conducting part of the respiratory system?

• A. It clears inhaled air from foreign particles
• B. Inhaled air is humidified
• C. Temperature of inhaled air is brought to body temperature
• D. Provides surface for diffusion of O2 and CO2

Answer 1

Answer: (D)

Provides surface for diffusion of O2 and CO2

Answer 2

The part starting with the external nostrils up to the terminal bronchioles constitute the conducting part whereas the alveoli and their ducts form the respiratory or exchange part of the respiratory system. The conducting part transports the atmospheric air to the alveoli, clears it from foreign particles, humidifies and also brings the air to body temperature. Exchange part is the site of actual diffusion of O2 and CO2 between blood and atmospheric air.