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Physical principles of the description of fluid flow through a system of pipes and so­me mechanical properties of the blood circula­tion are put forward. As an example, the velocity field of the model vertebro-basilar junction is pre­sented. The influence of some geometrical parameters on the blood flow and on the deve­lopment of atherosclerotic changes is shown, proving thereby the importance of studying the biomechanical properties of the cardiovascular system in optimization of the treatment of the di­sorders of this system.