Why doesn't our bodies get electrocuted when we're taking an EKG

Since our body's 70% water and the EKG tests for electrical signals, wouldn't that signal cause an electrical shock throughout our body?

The electrical signal is coming *from* you! it's the natural electricity that is created by your heart muscles. It is tiny - just a few millivolts at the skin surface. That's about 1/500 the voltage of a standard 1.5V battery.

EKG machines and most other medical equipment are designed so that they can't put any electricity into your body even if they go faulty.

The EKG does not send out electricity, it picks up the electric current produced by the heart.