What is the main function of the respiratory system?, To digest food, To pump blood, To exchange oxygen and carbon dioxide, To produce hormones, Which organ is the primary organ of the respiratory system?, Hearth, Liver, Lungs, Kidneys, Through which structure does air usually enter the body?, Stomach, Nose, Esophagus, Liver, What is the name of the tube that carries air from the throat to the lungs?, Trachea, Esophagus, Artery, Vein, Where does gas exchange occur in the lungs?, Trachea, Bronchi, Alveoli, Diaphgram

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