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B
Ventricular depolarization
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C
Auricular repolarization
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D
Ventricular repolarization
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Solution
The correct option is B Ventricular depolarization An electrocardiograph or ECG is a test used to measure the electrical activity of the heart. The test takes only about a few minutes and is devoid of any pain.
The electrical activity of the heart causes the heart muscles to contract that results in the pumping of the heart. The ECG is in the form of spikes and dips known as waves. The wave pattern helps in assessing the rate and rhythm of our heartbeat.
The P wave is the electrical excitation of the atria, or depolarization, initiating atrial contraction.
The QRS complex is the depolarization of ventricles, initiating ventricular contraction. Marking the beginning of the systole.
T wave means the return of ventricles to the normal state (repolarization), marking the end of the systole.