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Is the voltage at the heart the same as in limbs for ECGs?

Medical Sciences Asked on December 14, 2021

When doing an ECG we measure the electrical voltage between two points on a person’s skin (for example for Lead II it’s right arm and left leg).

I am confused as to how the heart’s potential difference can travel all the way to the skin. It seems like the potential difference is not that big and I would be very surprised to see that small charge difference make it through blood which is constantly moving.

I would like a more physics heavy explanation if possible.

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