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.
Using Polar Coordinates we mark a point by how far away, and what angle it is: To convert from one to the other we will use this triangle: When we know a point in Cartesian Coordinates (x,y) and we want it in Polar Coordinates (r, Î¸) we solve a right triangle with two known sides.