A text-book of first aid and emergency treatment . larynx, the trachea, the bronchi, and the lungs. The Nose.—Air is admitted to the body through the nose,which consists of the external nose and the nasal nasal passages are two in number, separated by a thinpartition, the nasal septum. In its passage through thenose the air is warmed and a certain amount of dust andother extraneous material is removed. If the air is dry itreceives sufficient moisture in the nose to render it lessirritating to the lungs. THE RESPIRATORY SYSTEM 59 The Larynx.—The air passes from the nasal passagesth
A text-book of first aid and emergency treatment . larynx, the trachea, the bronchi, and the lungs. The Nose.—Air is admitted to the body through the nose,which consists of the external nose and the nasal nasal passages are two in number, separated by a thinpartition, the nasal septum. In its passage through thenose the air is warmed and a certain amount of dust andother extraneous material is removed. If the air is dry itreceives sufficient moisture in the nose to render it lessirritating to the lungs. THE RESPIRATORY SYSTEM 59 The Larynx.—The air passes from the nasal passagesthrough the throat into the larynx, which is situated at thebeginning of the trachea. The larynx is located just behindthe base of the tongue, and during the act of swallowing itis covered with a thin fibrous flap, the epiglottis, whichprevents the entrance of food into the trachea. The larynxcontains the vocal cords, which are instrumental in producingthe voice. Vallecula Median glosso c2ngloUic foldEpiglottis fTuhercle of epiglottisVocal fold. Ventricular fold A ryepiglottic foldCuneifonn cartilage Corniculate cartilage TracheaFig. 25.—Showing larynx and vocal cords from above. (Gray.) The Trachea.—Below the laryixx is a firm tube-like struc-ture, the trachea, which passes downward in the midlineand can be felt in the lower anterior portion of the trachea acts as a passageway for the air between thelarynx and the bronchi, and is about one-half inch in diameterand several inches long. The Bronchi.—^The trachea divides, in the upper part ofthe chest, into two similar though smaller tubes, one toeach lung. These are the two main bronchi. These divideand subdivide into smaller bronchi, the smallest of whichare termed bronchioles. In this manner the air is distributedto all parts of the lungs. The Lungs.—The bronchi gradually become smaller, end-ing in minute air cells where the interchange of oxvgen takes GO ANATOMY AND PHYSIOLOGY place between the insi)ired ai
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