NDA 2026 Biology question
Which of the following properties of alveoli is/are helpful in gaseous exchange during respiration in human beings? I. The epithelial lining of alveoli is very thin. II. Elastic fibres are present in alveolar wall. III. Wall of alveoli is surrounded by many blood capillaries. Select the correct answer using the code given below.
Answer: (B)
Solution
Gases are exchanged by diffusion across the alveolar wall. The very thin epithelial lining gives a short diffusion distance and the dense network of blood
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