The respiratory system consists of the nose, paranasal sinuses (ethmoid, sphenoid, frontal and maxillary), larynx, tracheo-bronchial tree (trachea, bronchi and their smaller divisions), and lungs. The tracheo-bronchial tree conducts the inspired air from the nose and mouth to the lungs. Although the function of the paranasal sinuses is not clear, they may serve to provide moisture to the inspired air. The larynx contains the vocal cords and together with the rest of the respiratory system is concerned with the production of sounds and words. The act of breathing brings air into intimate contact with the blood circulating through the lungs so that gaseous exchange between them may take place.
KeywordsParanasal Sinus Allergic Asthma Spontaneous Respiration Status Asthmaticus Respiratory Depressant
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