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 rectangular coordinates (x, y) and polar coordinates (R, t) are related as follows. y = R sin t and x = R cos t. R = x + y and tan t = y / x. Problem 1: Convert the polar coordinates (5, 2.01) and (0.2, 53) to rectangular coordinates to three decimal places.Solution to Problem 1: 1  For the first point (5, 2.01) R = 5 and t = 2.01 and is in radians.2  Set your calculator to radians and use the above formulas for x and y in terms of R and t to obtain:roblem 1: Convert the polar coordinates (5, 2.01) and (0.2, 53) to rectangular coordinates to three decimal places. Solution to Problem 1: 1  For the first point (5, 2.01) R = 5 and t = 2.01 and is in radians. 2  Set your calculator to radians and use the above formulas for x and y in terms of R and t to obtain: