What does the vertical axis of an ECG represent?

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Multiple Choice

What does the vertical axis of an ECG represent?

Explanation:
The vertical axis shows the magnitude of the heart’s electrical signal, i.e., its amplitude in millivolts. The ECG records voltage differences over time, so how tall each deflection is reflects how strong the electrical activity is at that moment. The horizontal axis carries time, letting you see how the signal changes over milliseconds and seconds. Heart rate is derived from the timing of the spikes, and frequency isn’t the axis label for a standard ECG graph. So the vertical axis represents amplitude and voltage.

The vertical axis shows the magnitude of the heart’s electrical signal, i.e., its amplitude in millivolts. The ECG records voltage differences over time, so how tall each deflection is reflects how strong the electrical activity is at that moment. The horizontal axis carries time, letting you see how the signal changes over milliseconds and seconds. Heart rate is derived from the timing of the spikes, and frequency isn’t the axis label for a standard ECG graph. So the vertical axis represents amplitude and voltage.

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