What type of cells make up about 90% of the alveolar surface?
A)ciliated simple squamous epithelial cells
B)Type I pneumocytes
C)Type II pneumocytes
D)macrophages

Question

Quizplus · Accepted Answer

Type I pneumocytes make up about 90% of the alveolar surface and are responsible for gas exchange. Ciliated simple squamous epithelial cells and macrophages also play important roles in the respiratory system but do not make up the majority of the alveolar surface. Type II pneumocytes produce surfactant, which helps to reduce surface tension in the alveoli, but they only make up about 5% of the alveolar surface.

What Type of Cells Make Up About 90% of the Alveolar