To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 Slow-motion video recording of normal and bolus-induced ventricular activation. Asterisks indicate atrial contraction and bolus injection via catheter inserted into the apex as stimuli for subsequent ventricular contraction. Stretch–excitation correlation in the toad heart Vladimir A. Vityazev, and Jan E. Azarov Journal of Experimental Biology 2020. 223:None-None; doi: 10.1242/jeb.228882 Download Original Video