The figure given below shows a small part of the human lung where the exchange of gases takes place. Select the option which represents labelled part (A, B, C or D) correctly identified along with its feature.

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C: Endothelium - Simple squamous epithelium

A: Alveolus - Only site of gas exchange

B: Capillary - Drains into pulmonary artery

D: Erythrocyte - Contains carbonic anhydrase

answer is D.

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Detailed Solution

Carbonic anhydrase enzyme present in the erythrocytes catalyzes the formation of carbonic acid from CO2 and H2O and its dissociation into H+ and HCO3- at tissues. It also catalyzes the reverse reactions at the lungs. ‘C’ is alveolar epithelium (not endothelium which is the epithelium of the blood capillary). Exchange of gases occurs not only in the alveoli but also in the respiratory bronchioles, alveolar ducts and at systemic tissues. Pulmonary capillary drains oxygenated blood into the pulmonary vein (not the pulmonary artery)

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