How Do Lungs Clean Themselves?

The airways in the lungs are lined with a thin, watery mucus blanket. The mucus sits upon tiny, hair-like strands called “cilia.” The cilia and mucus blanket work together to keep the lungs clean and free from infection. The lungs are very clean—even though they are directly connected to the outside air, which is full… Continue reading How Do Lungs Clean Themselves?