English: Part A:

Schematic of an action potential, redrawn and labeled after the image originally produced by en:User:Diberri in Adobe Illustrator (reproduction in CorelDraw!). A version of the old drawing with no labels is available at en:Image:Action potential (no labels).svg. This illustration is based on en:Image:ActionPotential.png by en:User:Chris 73.

Part B:

An image of an actual action potential taken from the digital oscilloscope aspect of the program PClamp v9 (Axon Instruments). Action potential (blue line) is from a mouse hippocampal pyramidal neuron, evoked by a prolonged pulse of current (orange line) passed through the recording electrode into the cell. Imported into and labeled in CorelDraw!