Exam-style question
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Which of the following statements about ECG electrode placement is true?.
- A.Electrodes must be placed on the same side of the body to record a signal.
- B.Electrodes are placed on the skin to measure the voltage difference between two points.
- C.Electrodes are inserted into the bloodstream to capture the heart’s electrical activity.
- D.Electrodes are only needed on the chest to detect the heart’s signals.
Model answer
What a good answer should say
- Electrodes are placed on the skin to measure the voltage difference between two points.
Explanation
Why this works
ECG electrodes are positioned on the skin to record the potential difference between two sites, reflecting the heart’s electrical activity. Placement on both sides of the body is required for a complete 12‑lead ECG.
Common mistake
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