EHS 385 Lecture Notes - Lecture 22: Perfusion, Respiratory System, Circulatory System
9 Dec 2017
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Amount of air moved in or out of lungs per minute (v) Measurement of pulmonary volumes and rate of expired airflow. Daltons law: total pressure of gas mixture is equal to sum of pressure that each gas would exert independently. Calculation of partial pressure: pair = po2 + pco2 + pn2 [760 mmhg] Gas moves across blood-gas interface in lung due to diffusion. According to fick"s law of diffusion, the rate of gas transfer is directly proportional to all of the following factors except: thickness of tissue. Pulmonary circuit: same rate of flow as systemic circuit, lower pressure. When standing, most of blood flow is to base (bottom) of lung due to gravitational force. During exercise, more blood flow to apex (top) of lung. When standing, blood flow to the base of the lung is ____ blood flow to the apex of the lung. Efficient gas exchange b/t blood and lung requires proper matching to blood flow to ventilation.
