NUR 3125 Lecture Notes - Lecture 8: Arterial Blood Gas, Pulmonary Artery, Tidal Volume
Document Summary
Allow air to pass from alveous to aveolus. Contain cell components of inflammation and immunity. Folds over self and attaches to chest wall. Generally maintain negative pressure in chest cavity (-4 to 10 mmhg) Diffuse gases into and out of the lung. Respiratory rate x tidal volume = liters/min. Volume of air measured by pulmonary function tests. Arterial blood gas needed to determine adequacy of ventilation. Mechanical movement of air into and out of the lungs. Automatic rate set by neurons in brain stem that send impulses to intercostal muscles. Sensitive to increase size or volume of lungs. Decrease ventilatory rate and volume when stimulated. Prevent over expansion of lung (in newborns) Active with high volume activities (exercise in adults) Monitor po2, pco2, and ph of arterial blood. Primary regulator of depth and rate of ventilation. Function impaired when chronic elevation of co2. Most sensitive to changes in po2 in arterial blood.
