QRS complex represents____________?
Correct answer: B. Ventricular systole
- A. Atrial systole
- B. Ventricular systole
- C. Atrial diastole
- D. Ventricular diastole
Explanation
The QRS complex records ventricular depolarisation, which initiates ventricular contraction or ventricular systole. Students may choose atrial systole because it is also a contraction phase, but atrial depolarisation is represented mainly by the P wave.
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About Cardiac Cycle and Heartbeat
The cardiac cycle describes atrial systole, ventricular systole and diastole, including pressure changes, blood movement and the opening or closing of heart valves. It also covers the conduction pathway from the sinoatrial node through the atrioventricular node, bundle of His and Purkinje fibres, and relates these events to heartbeat sounds.
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