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respiratory system n a system of organs functioning in respiration and consisting esp. of the nose, nasal passages, nasopharynx, larynx, trachea, bronchi, and lungs called also respiratory tract see LOWER RESPIRATORY TRACT, UPPER RESPIRATORY TRACT
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the combination of organs and tissues associated with breathing. It includes the nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, and lungs and also the diaphragm and other muscles associated with breathing movements.
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the tubular and cavernous organs and structures by means of which pulmonary ventilation and gas exchange between ambient air and the blood are brought about; the chief organs involved are the nose, larynx, trachea, bronchi, bronchioles, and lungs. Called also systema respiratorium [TA] and respiratory apparatus or tract. See Plate 43.
PLATE 43 ORGANS OF THE RESPIRATORY SYSTEM
Medical dictionary. 2011.