[The reactions of the arterial and venous microvessels in hypertension and alloxan diabetes in rats].

In hereditary hypertension and chronic diabetes, the number of arterial capillary ends decreased at the arterial side and increased at the venous one in rats. The density of endotheliocyte nuclei decreased in the arteries and increased in the capillaries and veins in the mesentery of the HAHIS rats. The thickening of the venous vessels' walls was more obvious in the SHR rats. The findings suggest different velocities of the proliferative processes in the two types of vessels.