I dont need you to write the 1-page, but I need help understanding how electrica

Question

I dont need you to write the 1-page, but I need help understanding how electrical activity is measured by a 3-lead EKG. Thank you!

Cardiac Conduction: Research and write a 1-page description of how electrical activity is measured by a 3-lead EKG machine. Use physical mechanisms such as action potentials, excitation waves, and electrical conductivity of tissues when writing your explanation; don't just write a description of how an EKG machine is hooked up and interpreted. Expectations for the quality of your writing will be high. (40 points)

Explanation / Answer

A 3 lead ECG 3 is having 3 leads as follows-
Red which is connected to right arm
Yellow which is connected to left arm
Green or black which is connected to left leg.
The recording of the electrical activity of the heart is ECG.
The action potential will be recorded by an electrical activity from one myocardial muscle cell.
It records all the action potentials generated of the myocardium and produces a combined trace.
The potential difference across the membrane of myocardial cell at rest is -90mV.

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