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• W2063130007 abstract "1. Basic electrophysiological and contractile properties of the fish ( Carassius carassius L.) heart ventricle were examined in vitro. Resting potential and characteristics of the action potential were typical for a vertebrate heart. The duration of action potential was long (APD50 = 556 ±56 ms at 20°C) and correlated with the duration of isometric contraction (TPT = 496 ± 26 ms at 20°C). 2. The force of isometric contraction declined with increasing stimulation rate. This effect was due to the shortened duration of active state at low frequencies (0.2-0.6 Hz) but at higher rates (0.8 and 1.0 Hz) it was also due to the decline of intensity of active state. 3. Decrease in bath temperature increased force of contraction, which was caused by the lengthening of the duration of the active state. 4. Isoprenaline and adrenaline improved contractility but phenylephrine, in the presence of β -blocker propranolol, had no effect. This shows the presence of functional β-receptors but absence of β-receptors in the fish ventricle. 5. Catecholamines were not detected in the ventricular myocardium by fluorescence spectrophotometry, and tyramine failed to improve the contractility of ventricular strips, suggesting that adrenergic innervation of the crucian carp ventricle is sparse or nonexistent. 6. The positive inotropic effect of isoprenaline in fish ventricle is qualitatively different from that found in mammalian hearts in that the specific relaxing influence of β -receptor activation is totally lacking. 7. Caffeine (5 mmol/l) improved contractility without effect on relaxation. 8. These results suggest that the contraction of crucian carp ventricle is primarily regulated by sarcolemmal mechanisms and its contractility is modulated by circulating catecholamines through β -adrenergic receptors." @default.
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• W2063130007 date "1989-01-01" @default.
• W2063130007 modified "2023-09-26" @default.
• W2063130007 title "Regulation of contractility of the fish (Carassius carassius L.) heart ventricle" @default.
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• W2063130007 doi "https://doi.org/10.1016/0742-8413(89)90101-1" @default.
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