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thin hairs attached to the mucous membrane epithelium lining the respiratory tract. They clear bacteria and foreign substances from the lung.
muscle separating the chest and abdomen. It contracts and relaxes to make breathing possible.
lid-like piece of cartilage that covers the larnyx, preventing food from entering the larynx and trachea during swallowing.
region between the lungs in the chest cavity. It contains the trachea, heart, aorta, esophagus, and bronchial tubes.
essential parts of the lung, responsible for respiration; bronchioles and alveoli
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