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Using path analysis a model of the oxygen transport system was developed. The sources of data were correlation coefficients from the published results. Path analysis delineated a model of this system comprising ten components: blood volume, heart volume, total hemoglobin concentration, oxygen consumption, oxygen uptake, work capacity, cardiac output, heart rate, stroke volume, and diffusing capacity. The model was physiologically consistent. In the healthy human the variance of the system as a whole was greater than the variance of the components; in the unhealthy the opposite held.


On Figure 2, p. 134, of "Path Analysis of Selected Components of the Oxygen Transport System," in the May 1979 issue of Human Biology, the symbol "DL" should appear at the lower left corner of the path diagram.