Question

The walls of the alveoli are composed of two types of cells, type I and type II. What is the function of type I?

Answer 1

Alveoli are thin-walled, sac-like structures lined by a single layer of flattened squamous epithelial cells: type I pneumocytes.  This extremely thin nature of the type I pneumocytes facilitates gas exchange across their surface

while

Type II pneumocytes are cuboidal epithelial cells frequently residing in the corners of alveolar spaces.  Type II pneumocytes are responsible for the secretion of surfactant.  Surfactant is a fluid composed of phospholipids and proteins that coats the surface of alveolar spaces to reduce surface tension, allowing for alveoli to expand and remain open.  In addition, type II pneumocytes play a crucial role in tissue repair in the lung.  ..

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