BE309 Respiratory System PDF

Respiratory system General physiology Conduction zone (mouth, nose, sinuses, pharynx, trachea, bronchi, and bronchioles) Air that enters the body is warmed, humidified, filtered, and cleane...

Respiratory system General physiology Conduction zone (mouth, nose, sinuses, pharynx, trachea, bronchi, and bronchioles) Air that enters the body is warmed, humidified, filtered, and cleaned. Trachea> Left and right bronchi> Bronchioles -> More than 15 generations. Movement of gas – convective flow. Conduction zone General physiology Most of the mass of the lungs - Where gas exchange between air and blood occurs. Consisting of respiratory bronchioles with outpouchings of alveoli and terminal clusters of alveolar sacs. Mechanism – Diffusion. Thickness of alveolar walls ~ 400 nm! Respiratory zone Lung capacity Tidal breathing – normal inhalation/inspiration and exhalation/expiration cycle. Functional residual capacity – amount of air remaining in the lungs after normal tidal exhalation. Inpiratory reserve volume – amount of air that can be inspired after tidal inhalation. Expiratory reserve volume – amount of air that can be exhaled after tidal exhalation. Residual volume – Amount of air remaining in lungs after maximum expiration Lung capacity Discerning lung disease Pulmonary function testing - Spirometers