Lung cells are specialized cells found in the respiratory system, primarily responsible for gas exchange. The main types include alveolar cells, which line the air sacs and facilitate oxygen and carbon dioxide transfer, and bronchial epithelial cells, which protect the airways and help trap particles and pathogens. These cells work together to maintain healthy lung function. Cilia, tiny hair-like structures on bronchial cells, help move mucus out of the lungs, while surfactant produced by alveolar cells reduces surface tension, preventing the air sacs from collapsing. Proper functioning of lung cells is essential for effective breathing and overall health.