Question

Some features of alveoli are mentioned below. Select the INCORRECT option

• A. Have extensive network of blood vessels
• B. Are thin walled
• C. Have large surface area
• D. Are finger-like structures

Answer 1

Answer:

D. Are finger-like structures

• All the options except option D are correct features of alveoli.

• Alveoli are thin-walled, not thick-walled, structures.

• The walls of the alveoli are very thin, which makes it easier for oxygen and CO₂ to pass between the alveoli and very small blood vessels (capillaries).

• Therefore, the incorrect option is D

• Each alveolus is cup-shaped with very thin walls.

• It's surrounded by networks of blood vessels called capillaries that also have thin walls