Conducting and Respiratory Parts — NEET Biology
✅ Asked in NEET 2022Which is not a function of the conducting part of the respiratory system? NEET 2022
Which is not a function of the conducting part of the respiratory system? NEET 2022
Answer & NCERT explanation
Correct answer: D — Site of gas exchange
The conducting part of respiratory system includes nasal cavity, pharynx, larynx, trachea, bronchi and bronchioles. These structures condition the air by filtering particles, humidifying and warming it to body temperature. Gas exchange occurs only in respiratory part (alveoli), not conducting part. Option d is correct as gas exchange is NOT a function of conducting airways.
Read more NCERT concept on the PYQ
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.
The respiratory system has two functional parts: the conducting part (nose to terminal bronchioles) that filters, warms, and humidifies air, and the respiratory part (alveoli) where actual O₂ and CO₂ exchange occurs with blood. Students often confuse which structures perform which functions—thinking the entire lung does gas exchange, when only alveoli are the site of diffusion. Remember: conducting airways prepare the air but don't exchange gases, while alveoli are thin-walled sacs where diffusion happens. NEET frequently tests questions asking which part performs specific functions like clearing foreign particles versus exchanging gases, so clearly distinguish these two anatomically and functionally separate regions.
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