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Given below is the ECG of a normal human. Which one of its components in human is correctly interpreted below.

1. Complex QRS-One complete Pulse
2. Peak T-Initiation of total cardiac contraction
3. Peak P and Peak T-Represent Systolic and diastolic blood pressure
4. Peak P-Initiation of left atrial contraction only

Correct answer: Complex QRS-One complete Pulse

Solution

The QRS complex represents ventricular depolarization, which is the major electrical event associated with one heartbeat/pulse. The other options confuse ECG waves with mechanical contraction or blood pressure values.

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