PSL301H1 Lecture Notes - Lecture 15: Spirometry, Vital Capacity, Arteriole
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PSL301H1 Full Course Notes
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Document Summary
Exchange of gases between air and blood (alveoli of the lungs) Nasal cavity air enters the system. Trachea splits into left and right bronchus. Alveolus surrounded by blood capillaries, exchange of. There is 22 divisions that lead to the alveolus. Pleural cavity is filled with fluid, which aids in reducing friction during breathing. Surface tension of the pleural fluid also leads to close apposition of the lung surfaces with the chest wall. This relationship allows for greater inflation of the alveoli during respiration. Larynx (vocal chords) trachea (rings help prevent collapse) . Primary bronchus secondary bronchus bronchiole alveoli. Watery saline layer allows cilia to push mucus towards pharynx. Pharynx is the passage way between larynx and esophagus, you can either swallow the mucus, or spit it out. 300 million alveoli, each about 300 m in diameter. Total cross-sectional area is very large, about 180 cm2, and air velocity virtually zero. Richly supplied with blood through capillaries surrounding the alveoli.
