Abstract
Abstract 1. The atrial cardiac tissue of the Atlantic salmon was pre-incubated with 3 H-adrenaline before transmural electrical field stimulation at 8°C in vitro . 2. The total contractile tension response and the total 3 H-release, but not the net 3 H-release per pulse, increased in proportion to the stimulus frequency from 1 to 4 Hz. These responses were nearly abolished by guanethidine and counteracted by propranolol. 3. The results indicate that in vitro accumulated adrenaline was released from a neuronal pool activating atrial contractility via β-adrenoceptors, and are consistent with our hypothesis of a neuronal uptake of plasma adrenaline for re-use as neurotransmitter during and following periods of stress.
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