Exam-style question
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Describe the relationship between the P wave, QRS complex, and T wave in an ECG and their corresponding stages in the cardiac cycle.
Model answer
What a good answer should say
- The P wave represents atrial depolarization, occurring just before the atria contract.
- The QRS complex indicates ventricular depolarization, which occurs just before the ventricles contract.
- The T wave represents ventricular repolarization, occurring as the ventricles relax.
Explanation
Why this works
This answer effectively links the features of the ECG waveform to the stages of the cardiac cycle, demonstrating an understanding of how electrical signals correlate with heart activity. It tests the ability to connect physiological processes with their electrical representations.
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