Surfactant:
A) is produced by pneumocytes type I.
B) phagocytizes dust or debris.
C) replaces mucus in the alveoli.
D) plays a key role in keeping alveoli open.
E) is not found in healthy lung tissue.

The surfactant is composed of the proteins and lipids which plays a role in keeping alveoli open by reducing the surface tension formed between the air and liquid.

The surfactant act by forming a monolayer surface film which helps reduce the surface tension.

Thus, option-D is the correct answer.

Surfactant: A) is produced by pneumocytes type I. B) phagocytizes dust or debris. C) replaces mucus in the alveoli. D) plays a key role in keeping alveoli open. E) is not found in healthy lung tissue.

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Surfactant:
A) is produced by pneumocytes type I.
B) phagocytizes dust or debris.
C) replaces mucus in the alveoli.
D) plays a key role in keeping alveoli open.
E) is not found in healthy lung tissue.