[Rhythm assimilation in the isolated canine heart under isovolumic conditions].
Isolated canine heart has an expressed ability for autoregulation of bioelectrical and contractile functions irrespective of the neurohumoral factors influence on the work of the heart, and Frank-Starling law. Under the change of stimulation frequency, the autoregulation of heart functions is carried out as rhythm assimilation at organ (cell) level. The heart has a higher ability to bioelectrical rhythm assimilation rather than the mechanical rhythm assimilation. Incomplete rhythm assimilation is characterised by the alternation of contractions. The "Everything or nothing" law has no applicability to the work of the heart.
Gur'ianov
M I
MI
Severtsov Institute of Ecology and Evolution, Russian Acad. Sci., 626150, Tobolsk, 15 Voikov St., Russia.
D000200:Action Potentials; D000818:Animals; D005117:Cardiac Complexes, Premature; D004285:Dogs; D004558:Electric Stimulation; D004562:Electrocardiography; D005260:Female; D006321:Heart / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D008297:Male; D009200:Myocardial Contraction / Q000502:physiology*