Trachea, Longest tube in the respiratory system, Bronchi, These 2 tubes branch from the trachea, Bronchioles, These tubes are smaller than bronchi, Cartilage, A supportive tissue that keeps the trachea open, Nasal Cavity, Where air is first moistened behind the nose, Larynx, Contains the vocal chords, Cilia, Small hairlike structures that push mucus upward, Alveoli, Air sacs that exchange air, Capillary, Tiny blood vessels 10 microns that cover alveoli, Oxygen, A gas that is inhaled to be diffused into blood stream, Carbon Dioxide, A gas to be exhaled to be diffused out of the blood stream, Respiration, Where oxygen is used in the cells, Breathing, The mechanical collection of air for the body, Asthma, An allergic reaction caused by pollen, Pneumonia, Inflammation of the lung caused by bacteria, Exhalation, Air that leaves the lungs, Inhalation, Air that enters the lungs, Diaphragm, Muscle below lungs which controls the chest volume, Epiglottis, Covers the trachea to prevent the entry of food, Liter, Unit used to measure lung capacity

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