Physiology 3120 Lecture Notes - Partial Pressure, Respiratory Tract, Bronchus
26 Nov 2011
School
Department
Course
Professor
Document Summary
Co2 out, o2 in; oxygen from atmosphere into blood, carbon dioxide from blood into atmosphere. Partial pressure of a gas in solution. Equal to the partial pressure of the gas in equilibrium with the mixture. Regardless of the solubility of the gas in solution. Partial pressure of oxygen in arterial blood is pao2: structure. Structure & function of the lung: main function of the lung is gas exchange. Occurs by diffusion, which occurs according to fick"s law of diffusion. Space between chest wall and lung (intrapleural space) has subatmospheric pressure; pressure within the lung (intrapulmonary space) is atmospheric. Ipp is negative because: elastic properties of the lung and tendency of chest wall to move outward (lung wants to collapse, chest wall wants to expand, creating a pneumothorax (hole in the diaphragm), lung collapses, chest wall. Blood vessels and blood flow expands, and the ipp becomes 0.
