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adenoids
collections of lymph tissue in the nasopharynx (AKA pharyngeal tonsils)
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alveolus
air sac in the lung
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apex of the lung
uppermost portion of the lung
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base of the lung
lower portion of the lung
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bronchioles
smallest branches of the bronchi
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bronchus
branch of the trachea (windpipe) that is a passageway into the air spaces of the lung; bronchial tube
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carbon dioxide
a gas produced by body cells when oxygen and food combine; exhaled through the lungs
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cilia
thin hairs attached to the mucous membrane epithelium lining of the respiratory tract
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diaphragm
muscle separating the chest and abdomen, most important muscle for breathing
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epiglottis
lid-like piece of cartilage that covers the larynx
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glottis
opening to the larynx
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hilum (of lung)
midline region where the bronchi, blood vessels, and nerves enter and exit the lungs
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mediastinum
region between the lungs in the chest cavity
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oxygen
gas that passes into the bloodstream at the lungs and travels to all body cells
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palatine tonsil
one of a pair of almond-shaped masses of lymphoid tissue in the oropharynx
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paranasal sinus
one of the air cavities in the bones near the nose
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parietal pleura
outer fold of pleura lying closest to the ribs and walls of the thoracic cavity
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pharynx
throat; composed of the nasopharynx, oropharynx, and laryngopharynx
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pleura
double-folded membrane surrounding each lung
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pleural cavity
space between the folds of the pleura
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pulmonary parenchyma
the essential cells of the lung
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visceral pleura
the inner fold of pleura lying closest to the lung tissue
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