[The effect of changes in the blood flow and the level of arterial and venous pressures on the filtration-absorptive processes in the small intestine].

Under conditions of perfusion of the small intestine's vessels with constant volume of the auto-blood, stationary shifts of the arterial perfusion pressure by +/- 50 mm Hg and/or blood flow by +/- 50% of the initial level practically did not affect the size of the exchange surface of the organ's microvessel bed (the capillary filtration coefficient) or the average capillary pressure in artificially stabilised pressure of venous outflow at the level of 6 mm Hg. However, under conditions of normo-, hypo- and hypertone of the small vessels' smooth muscles, the shifts of the venous outflow pressure (from 0 to 24 mm Hg) increased the exchange surface of the microvessels and the average capillary pressure. The mechanisms of the shifts in microhemodynamics and transcapillary exchange of fluid are discussed.

[Resistance and capacitance functions of gastric vessels under the action of noradrenaline].

In acute experiments on cats, the gastric vascular bed being perfused under constant blood flow, the actions of gastric vessels was investigated using newly elaborated approach to their humoral isolation. Increased doses of noradrenaline elicited the dose-dependent constrictive response of gastric arterial vessels. Perfusion pressure increase in the gastric vascular bed under action of the minimal dose of noradrenaline was more pronounced, than in the intestinal vessels.

[Lymph-blood microcirculatory shifts in the intestines during histamine action].

The infusion of histamine increased the lymph flow in the cat innervated intestine due to squeezing off of the lymph from lymphatic vessels under motor activation of the intestine, followed by an increase in the lymph production because of accelerated transcapillary transfer of fluid from the blood into interstitium. The increase in the water hemato-lymphatic transition was maintained by an augmentation of the capillary filtration coefficient against the background of both a decrease and an increase tin capillary hydrostatic pressure occurring simultaneously with a drop of the perfusion pressure under the effect of histamine. After decentralization of the intestine histamine led to a drop of capillary hydrostatic pressure, leaving the shifts of other parameters the same.

[Coupled functions of the vessels of the small intestine in various perfusion modes during histamine action].

The resistance, capacity and metabolic functions of the small intestine vessels were studied in i.a. infusion of 0.