Abstract
Summary
Residual red cell, plasma, and blood volumes were measured in the small vessels of nine major organs of the developing beagle, ranging in age from 4 hr to 7 months. The animals were sacrificed by bleeding. The tissues analyzed were the heart, lung, kidney, spleen, liver, stomach, intestines, muscle, and skin. The data showed that these organs contain a significantly larger volume of the total blood volume in the newborn than in the 3- to 7-month-old dogs. In all age groups the muscle, skin, and liver contained the largest amount of blood, approximately 70% of the total organ blood volume. With the exception of the spleen, and in some cases the liver, the organ hematocrits for a particular age group were lower than the corresponding total body and the large vessel hematocrits.
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