During the first appearance of pulmonary surfactant, type 1 cells also appear.

Name: During the first appearance of pulmonary surfactant, type 1 cells also appear.
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Pulmonary surfactant is produced by type II alveolar cells, not type I cells. Type I cells are involved in the gas exchange process due to their thinness, while type II cells produce surfactant to decrease surface tension and prevent alveolar collapse.

During the First Appearance of Pulmonary Surfactant, Type 1 Cells