alveolus - tiny air sacs, cartilage - arranged in rings, keeps the trachea open, trachea - also known as the windpipe, ventilation - the process of air moving into and out of the lungs, respiration - release of energy from food, carbondioxide - waste gas produced by respiration, glucose - raw material need for respiration, limewater - turns cloudy in the presence of carbon dioxide, mucus - traps bacteria and dust, prevents particles entering the lungs, bronchioles - link the bronchus to the alveoli,

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