Distribution of labeled erythrocytes in adipose tissue and muscle in the rat

Distribution of erythrocytes with chromium 51 was used to compare the capillary volume of adipose tissue and resting skeletal muscle of rats. Based on wet weight, the vascular bed of adipose tissue is of the same order of magnitude as that of muscle, whereas the protein content of the muscle is approximately 16 times greater. The size of the vascular bed per gram of adipose and muscle tissues decreased considerably during aging.

The estimation of red cell volume with 51Cr-labelled erythrocytes and plasma volume with radioiodinated human serum albumin

The validity of a simplified procedure for the direct estimation of both red cell and plasma volume, using (51)Cr-labelled erythrocytes and radioiodinated human serum albumin, has been examined. It is suggested that the procedure, involving three venepunctures only, will yield accurate measurements of both compartments.