[The pump function of the lymphangion and the effect on it of different hydrostatic conditions].

In isolated bovine mesenteric lymphangions, the dependence of their productivity on the values of the end-diastolic pressure and the gradients of hydrostatic pressure, was revealed. The maximum of a lymphangion's productivity took place about 10 cm H2O of intravascular pressure. Negative hydrostatic gradient depressed the pump function whereas positive one activated it. Variable hydrodynamic pressure gradients seem to exist in lymphatic vessels.