KHP 1139 Lecture Notes - Lecture 15: Bronchospasm, Sputum, Stridor

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Diffusion of gases between he alveoli and pulmonary capillaries. Upper respiratory system - mouth, nose, pharynx, and larynx lower respiratory system - trachea, lungs, bronchi, bronchioles, alveoli, pulmonary capillary network, pleural membranes. Pulmonary ventilation: ventilation is accomplished through breathing inspiration - inhalation expiration - exhalation (needs elasticity) Intact thoracic cavity capable of expanding and contracting. Intrapleural pressure - pressure in the pleural cavity around lungs (usually negative pressure) Tidal volume - amount of air you can inspire/expire (500 ml) Lung capacity - expansion and stretchability of lung tissue. Lung recoil - continual tendency of lungs to collapse away from the chest wall. Atelectasis - collapse of a portion of lungs (immobility, secretion build-up) Surfactant - lipoprotein produced by alveolar cells that act like detergent, reducing the surface tension of alveolar uid; without expansion is exceedingly dif cult and the lungs collapse. Dependent on: cardiac output number of rbcs and hematocrit exercise - promote circulation.

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