The site of gas exchange in lungs is
Correct answer: C. Alveoli
- A. Bronchi
- B. Bronchioles
- C. Alveoli
- D. Trachea
Explanation
Alveoli are the site of gas exchange, with thin walls and large surface area for efficient O2 and CO2 diffusion.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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