The action potential is a sudden positive shift in the cardiomyocyte's cellular membrane potential, termed depolarization. Depolarization not only initiates contraction within the affected cardiomyocyte (Described in Cardiac Excitation-Contraction Coupling), but also initiates depolarization of adjacent cardiomyocytes.
Polar Coordinates The coordinate system which depicts the points from the pole to the certain distance at a particular angle is known as âpolar coordinatesâ. The positive horizontal axis in which that particular angle rotates is named as âpolar axisâ.
Polar coordinate system - Calculus. 1  Calculus can be applied to equations expressed in polar coordinates. [16] [17] 2  The angular coordinate Ï is expressed in radians throughout this section, which is the conventional choice when doing calculus.