[The thrombogenic properties and thromboresistance of the vessels in amphibians and reptiles].

Rats, frogs and snakes significantly differed in their thrombogenic activity and thromboresistance of microcirculatory vessels. Mammals revealed a higher thrombogenic activity and a more significant difference between arterioles and venules. Changes of hemodynamic parameters in arterial and venous parts occurring in the course of evolution seem to involve differences in vascular tone as well as in thromboresistance and thrombogenic activity.