01:119:150 Lecture Notes - Lecture 13: Respiratory Tract, Sidestream Smoke, Vocal Folds

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The respiratory system - provide o2, dispose of co2. Breathing (ventilation) - moving air in and out of the lungs. External respiration - exchange o2/co2 between the lungs and the heart. Internal respiration - exchange o2/co2 between blood and cells. Fuel + o2 energy + co2. Lower respiratory tract - beck and thoracic cavity. Air enters the upper respiratory tract through. A primary function of the upper respiratory tract is to protect the lower tract. Inhaled air then passes to the pharynx. Inhaled air passes through the pharynx to the larynx. The larynx is the last structure in the upper respiratory tract. The larynx functions as the voice box because it contains the vocal cords. Epiglottis : closes the larynx when you swallow so that food goes down the esophagus. Gas exchange takes place in the lower respiratory tract. Laryngitis - inflammation of the larynx; vocal cords are not able to vibrate freely.

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