Abstract
1. 1. Electrical and mechanical properties of the conus arteriosus were studied in bullfrogs. 2. 2. Action potential duration and contraction duration were dependent on the external calciutn concentration. 3. 3. The amplitude of contraction and time to peak tension increased with increasing calcium concentrations. 4. 4. The time interval between the onset of the action potential and the onset of contraction decreased with increasing calcium concentrations. 5. 5. The action potential was of exceptionally long duration and may underlie the tissue's lengthy hemodynamic systole. 6. 6. The results are consonant with a contraction controlled by the membrane action potential.
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