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.
The radial coordinate is often denoted by r or Ï, and the angular coordinate by Ï, Î¸, or t. The angular coordinate is specified as Ï by ISO standard 31-11. Angles in polar notation are generally expressed in either degrees or radians (2 Ï rad being equal to 360Â°).