The alveoli is lined by:
Correct answer: B. Squamous epithelium
- A. Cuboidal epithelium
- B. Squamous epithelium
- C. Columnar epithelium
- D. Transitional epithelium
Explanation
The alveoli, which are tiny air sacs in the lungs, are lined by a type of epithelium called squamous epithelium. This lining is made up of thin, flat cells that allow for easy diffusion of oxygen and carbon dioxide during the process of gas exchange in the lungs. This efficient exchange of gases is essential for proper breathing and oxygenation of the blood.
This question appeared on the KMU Centralized Admission Test 2021 paper, which you can sit online with every answer explained.
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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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