Question

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.

Answer 1

The correct answer will be option-D

Step-by-step explanation:

Pulmonary Surfactant is a complex substance produced by the pneumocytes epithelial II cells in the alveolar sac.

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.