The function of surfactant is/are

Options

A. Facilitating lung expansion
B. Maintaining the stable size of the alveoli
C. To reduce the surface tension on the alveoli
D. All the above

Answer

D

Explanation

Pulmonary surfactant is a surface-active lipoprotein complex. It reduces the surface tension throughout the lung and thus facilitates lung expansion and maintain the size of alveoli.