In vitro, the Wistar rat tail artery segments were perfused with the Crebs-Henselite solution. Under the conditions of perfusion pressure increasing from 0 to 110 mm Hg with the velocity of 5 mm Hg/min, the "diameter-pressure" curves were obtained. Changes in the vessel diameter during increase of pressure in the vessel were accompanied by vasomotions. For the first time, a regularity of the vasomotion direction changes as determined by an increase or decrease of the vessel diameter was established. The increase of the vessel diameter was accompanied by a sequence of its spike-formed decreases, whereas decrease of the vessel diameter was accompanied by a sequence of its spike-formed increases.
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