Explain an aspect of cardiac physiology, Write about the category listed below:
Action potential of cardiac contractile cells
A minimum of one scholarly article is to be cited and a total of 250 words and 1 diagram example. 
While APA style is not required for the body of this assignment, solid academic writing is expected, and documentation of sources should be presented using APA formatting guidelines, which can be found in the APA Style Guide, located in the Student Success Center