Trachea - Scientific term for the windpipe, Bronchi - small tubes leading to each lung, ciliated - type of cells lining the trachea and bronchi, mucus - traps dirt and pathogens, alveoli - the site of gas exchange, diaphragm - muscle separating the thorax from the abdomen, intercostal muscles - move the ribs during ventilation, bronchioles - smallest tubes in the respiratory system, oxygen - the gas which moves from the alveolus into the blood, diffusion - the process by which gas exchange takes place, carbon dioxide - a waste produce that must be exhaled, ventilation - another word for breathing, respiration - this is NOT the same as breathing!,

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