Presentation of a mathematical model of the respiratory controller, one of the mechanisms whereby the body attempts to maintain a constant concentration of carbon dioxide. The model stresses information transport in blood and attempts to test the widely held hypothesis that the respiratory controller is a proportional controller, whose error signal is the difference between the tissue carbon dioxide concentration in the respiratory center and some reference level. Although the model simulates some experimentally observed phenomena, it becomes unstable under other circumstances. The reasons for this are discussed. 58 pp.
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