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Trachea has stiff rings of cartilage to prevent it collapsing Bronchi Bronchioles Rib muscles to raise and lower the ribs Ribs to protect the chest Lung Alveoli (air sacs) gas exchange takes place here Diaphragm muscular sheet Alveoli are very good at exchanging gases because They have a LARGE surface area They have a good blood supply They are moist This picture shows cilia on the cells lining the airways