Ribs - Protect the lungs, Cartilage - Prevents the trachea from folding, Diaphragm - Muscle that controls breathing, Trachea - The windpipe between mouth/nose and lungs, Bronchi - The branches made when the windpipe splits in two, Bronchioles - Branches once the bronchi split further, Alveoli - Air sacs at the end of bronchioles - site of gas exchange,

Lungs

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