Respiratory System. Respiratory Tract . Respiratory Systems . Respiratory Tracts . System, Respiratory . Systems, Respiratory . Tract, Respiratory . Tracts, Respiratory . 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. . 1.00
Respiratory System Agents. Agents, Respiratory System . Stimulants, Respiratory . Respiratory Stimulants . Drugs used for their effects on the respiratory system. . 0.86
Respiratory System Abnormalities. Abnormalities, Respiratory System . Abnormality, Respiratory System . Respiratory System Abnormality . System Abnormalities, Respiratory . System Abnormality, Respiratory . Congenital structural abnormalities of the respiratory system. . 0.76