Experimental validation of morphometric analysis.

<p><b>A</b> - Morphometric analysis of spontaneous contractions. <b>B</b> - Morphometric analysis of hCMs induced to contract with electrical stimulations. <b>C</b> - Morphometric analysis of spontaneously contracting hCMs captured by exogenous electrical stimulations. In graphs A–C, the dashed line represents the applied exogenous electrical stimulation, the black line shows the contractions/displacement of hCMs. <b>D</b> - Graph reporting the measured frequency as a function of the applied frequency.