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

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