[The rheological properties of the large lymphatic vessels].

The resiliency module of the cuff of the bull mesenteric lymphatic vessels' lymphangion in the circular direction within physiological limits of transmural pressure is, on the average, (3.1 +/- 0.4) x 10(4) H.m-2. The resiliency differential module depends on the functional state of smooth muscle cells. In maximal activation of the myocytes' contractile apparatus, the resiliency module of the muscle cuff increases by 1.7 times and, against the background of the myocytes relaxation, it decreases by 1.6 times. The valvular portion of the lymphangion is more rigid and its resiliency module changes rather insignificantly in contraction or relaxation of smooth muscle cells. High distensibility of the muscle cuff provides for the capacitance function and for the self-regulation of its pumping function. Rigid wall of the valvular portion eliminates the insufficiency of the valves at a high transmural pressure and maintains an efficient work of the valvular apparatus.