Abstract

An analytical model of the external respiratory system is presented that embodies the important aspects of the previous capillary and gas side studies. The capillary bed is represented by a set of distributed-parameter flow-forced diffusional tubes, while the lungs are divided into two compartments—a dead space and a gas exchange space. Based upon realistic physiological properties, the concentrations of oxygen and carbon dioxide are determined as functions of time and position in the capillary bed, and as functions of time in the dead space and gas exchange regions under both normal and abnormal environmental conditions. The results provide a number of insights into the behavior of the respiratory system and the relative importance of some of the variables that affect it.

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