LYMPH AND TISSUE FLUIDS 



1139 



crystalloids, such as dextrose, urea, or sodium chloride, intot he circu- 

 lation. In this case the lymph becomes much more dilute. The 

 explanation of the action of these bodies is very simple. We have 

 already seen that injection of large amounts of dextrose into the 



40 



SO 



60 minutes 



in/, of 40 a rams dextrose 





6 1^3 45 6 769/0' ' "/ ' ' '20' 



3/e d to 240 com Inj. 18 grams dextrose 



30 



40 



' 'so' ' ' 'e'Omihut'es' 



FIG. 478. Effect on lymph flow and on arterial and venous pressures of injection 



of concentrated solution of glucose. 



In B the animal was bled to 240 c.c. before the injection. The double line 

 = lymph flow in c.c. per ten minutes ; thin line = portal vein ; thick line = 

 carotid artery ; dotted line = inferior vena cava. 



circulating blood raises the osmotic pressure of this fluid. The blood 

 therefore imbibes water from the tissues and swells up, i.e. a con- 

 dition of hydrsemic plethora is brought about as surely as if several 

 hundred cubic centimetres of normal salt solution were injected into 

 the circulation. This increase in the total volume of the blood causes 

 a rise of pressure throughout the vascular system arteries, capillaries, 



