alveoli - where gas exchange takes place, trachea - tube that carries air from the mouth/nose to the bronchi, bronchioles - tiny tubes that are branches of the bronchi, bronchi - the two tubes that branch from the trachea, diaphragm - sheet of muscle that is involved in inhalation and exhalation, ribs - bones that protect the lungs, intercostal muscles - muscles that are found between the ribs,

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