[Effect of static loads on the contractile activity of myocytes of the small coronary arteries].
The effect of initial stationary exertion on the mechanical activity of vessels' smooth muscles was studied under the potassium activation of the electromechanical coupling in the myocytes in the dog small coronary arteries of 400-500 mu in diameter. Increase of the load from 120 to 240 mg potentiated the contractile responses to administration of potassium ions into the vascular chamber and led to electromechanical type of coupling activation in the smooth muscles due to increased inflow of the calcium ions into the myocytes. Intracellular fractions of calcium ions seem not to participate in this process.
D000818:Animals; D055592:Biophysical Phenomena; D001703:Biophysics; D002118:Calcium / Q000502:physiology; D003331:Coronary Vessels / Q000187:drug effects / Q000502:physiology*; D004285:Dogs; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000187:drug effects; D009131:Muscle, Smooth, Vascular / Q000187:drug effects / Q000502:physiology*; D010812:Physical Stimulation; D011188:Potassium / Q000494:pharmacology
D011188:Potassium; D002118:Calcium
Vliianie staticheskoĭ nagruzki na sokratitel'nuiu aktivnost' miotsitov melkikh koronarnykh arteriĭ.