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GATE 2025 BM – Question 28

Sensors and Bioinstrumentation · Biopotentials and Electrodes · 1 mark · Multiple choice

In a human ECG, atrial repolarization is usually masked by which component?

  1. P wave
  2. QRS complex
  3. T wave
  4. ST segment

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Correct answer: (B) QRS complex

Explanation

Atrial repolarization occurs around the time of ventricular depolarization. Its smaller electrical signal is overwhelmed by the much larger QRS complex, B. The P wave instead primarily represents atrial depolarization.

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