[Formation of plasma capillaries when microcirculation is reduced].

In frogs' retrolingual membrane under conditions of reduced microcirculation, the blood circulating in the microvascular bed contains considerably lesser amount of erythrocytes which aids to the appearance of a large number of plasmatic capillaries transformed from the individual capillaries which: a) are initially narrower, b) whose angles of off--shoot are greater and c) in which the slowdown of blood flow is more pronounced than in the neighbouring branches.