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internal respiration

Exchange of oxygen and carbon dioxide between the blood and tissues.

external respiration

Exchange of oxygen and carbon dioxide between the lung and bloodstream

Common cold

upper respiratory infection

rhinitis

upper respiratory infection

sinusitis

upper respiratory infection

tonsillitis

upper respiratory infection

pharyngitis

upper respiratory infection

laryngitis

upper respiratory infection

tracheitis

lower respiratory infection

bronchitis

lower respiratory infection

bronchiolitis

lower respiratory infection

pneumonia

lower respiratory infection

trachea, bronchi, lungs

lower respiratory

nose, pharynx, larynx

Upper respiratory

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