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.
Angles are defined on the polar coordinate system the way they are on the unit circle, usually in radians. So, if you are given the polar coordinate (3, Ï/4), the point is three units from the center with an angle of Ï/4 radians measured counterclockwise from the polar axis: