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Acta Physiologica Congress

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Acta Physiologica 2012; Volume 206, Supplement 691
Scandinavian Physiological Society's Annual Meeting
8/24/2012-8/26/2012
Helsinki, Finland


NEW INSIGHTS INTO THE AVIAN HEART FUNCTIONAL ORGANIZATION
Abstract number: F13

PROSHEVA1 V, KASEVA1 N, DERNOVOJ1 B, KHARIN1 S

1Institute of Physiology, Pervomaiskaya street 50, 167982, Syktyvkar, Russia

The aim of this study was to advance our knowledge regarding the avian heart functioning. The experiments were conducted on adult chickens Gallus gallus domesticus (body mass, 1.4–2.0 kg). A microelectrode technique, echocardiography, intramural electrography and morphometry were used. The morphometrical investigation of the chicken heart demonstrated that a thickness of the right ventricular wall in the basal part was three-four times thinner than that of the left one. A left atrioventricular valve is tricuspid, fibrous. A right atrioventricular valve is a monocuspid muscle plate. It hasn't tendinous threads and papillary muscles. By method of the microelectrode mapping of action potentials an evidence of the presence of conducting and pacemaker myocytes in right muscle atrioventricular valve was presented. The ultrasound study showed a significant thickening of the muscle valve at the systolic part of cardiac cycle. This valve not only closes the right atrioventricular orifice, but also its contraction contributes to the right ventricle ejection fraction at the systolic part of the cardiac cycle. Under sinus rhythm, activation propagated in radial and tangential directions from multiple foci appearing within the ventricular free walls myocardium during 2–3 ms after the onset of their depolarization. In our opinion the revealed morphophysiological peculiarities of the avian heart have adaptive nature, providing the functioning of their cardiorespiratory system adequate to the organism requirements. This study was supported by the Russian Foundation for Basic Research (grant #11- 04-01933).

To cite this abstract, please use the following information:
Acta Physiologica 2012; Volume 206, Supplement 691 :F13

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