Which of the following components of the lung secretes a lubricating substance that allows the lung tissues to separate when inflated?
A) Bronchial tube
B) Capillary endothelium
C) Basement membranes
D) Respiratory membrane
E) Alveolar epithelium

Question

Which of the following components of the lung secretes a lubricating substance that allows the lung tissues to separate when inflated?  
A) Bronchial tube
B) Capillary endothelium
C) Basement membranes
D) Respiratory membrane
E) Alveolar epithelium

Quizplus · Accepted Answer

The alveolar epithelium secretes a thin layer of surfactant, which is a lubricating substance that reduces surface tension and prevents the lung tissue from sticking together when inflated.

Which of the Following Components of the Lung Secretes a Lubricating