. American journal of physiology. nts: in those in whichthe dilator reaction is small, or the viscidity great, the best flow isobtained when the blood is more diluted. These results can be understood by assuming that the viscidity isreduced in direct proportion to the dilution; whereas a moderatedilution reduces the dilator reaction proportionally less than greatdilution, i. c, according to a curve, somewhat as in Fig. 6. Inother words, a blood diluted with three volumes of salt solutiondilates the vessels almost as powerfully as undiluted blood, whilst ;oo Torald Sollmann. the viscidity is de
. American journal of physiology. nts: in those in whichthe dilator reaction is small, or the viscidity great, the best flow isobtained when the blood is more diluted. These results can be understood by assuming that the viscidity isreduced in direct proportion to the dilution; whereas a moderatedilution reduces the dilator reaction proportionally less than greatdilution, i. c, according to a curve, somewhat as in Fig. 6. Inother words, a blood diluted with three volumes of salt solutiondilates the vessels almost as powerfully as undiluted blood, whilst ;oo Torald Sollmann. the viscidity is decreased to one-third. This fact has a practicalimportance, because the dilutions which occur in the body are alwayscomprised within these limits. Accordingly, the renal effects ofhydrasmia correspond to those of a reduction of viscidity. To reproduce the conditions of hydrasmia more accurately, anumber of experiments were made in which undiluted blood was alter-nated with various moderate dilutions. The results are illustrated by. ?JOO - ?a - .^ _ z; 5 9 o o 320 - Z z z - 6^ o 3z 240 -a •a O tj o o o o o A = s 5 p CQ \ 16<) [^ /- L n v^ r^ L (V 80 010:3( 1 1 1 ^ 1 1 1 1 1 1 1 1 ) 11 12 1 2 Figure 6. — Diagram to explain the Figure 7. — The effects of diluting the bloodeffect of dilution on the vein flow. (Experiment 123) on the vein flow (drops per minute). Fig. 7. This shows that the vein flow is proportional to the same holds true of the ureter flow and oncometer. The phenomena agree exactly with those produced in living ani-mals as the result of saline injections. Here also there is observedan increase of the vein flow, ureter flow, and oncometer. This is cur-rently supposed to require a vital explanation, since the general bloodpressure is not increased. In my experiments, the injection of course also kept constant. There can be no doubt that all thephenomena can be explained very simply by the lessened viscidity,, without assuming any
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