The relative contribution of sarcoplasmic reticulum (SR) and sarcolemma in the regulation of cardiac contractility (twitch force, the rate of contraction and the rate of relaxation) at different time periods (10, 20 and 30 minuted) and at elevated extracellular potassium (5.omM) was assessed in the ventricular tissues of catfish and toad using adrenaline as an activator of SRCa2+ uptake, caffeine ...
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