Exams › NEET › Biology

In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by

1. (a) alveolar epithelium only
2. (b) alveolar epithelium and capillary endothelium
3. (c) alveolar epithelium, capillary endothelium and tunica adventitia
4. (d) alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitia

Correct answer: (b) alveolar epithelium and capillary endothelium

Solution

Gas exchange in alveoli occurs across the respiratory membrane, which is mainly the alveolar epithelium and the capillary endothelium. The tunica media and adventitia belong to larger vessel walls, not the diffusion barrier.

Related NEET Biology questions

• Skin is an accessory organ of respiration in
• Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.
• Name the chronic respiratory disorder caused mainly by cigarette smoking.
• Which of the following are the correct statement for respiration in human?
• Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct? The patient has been inhaling polluted air containing unusually high content of
• Reduction in pH of blood will

⚔️ Practice NEET Biology free + battle 1v1 →