The 'lub' sound in a heartbeat is produced during which phase of cardiac cycle?
Correct answer: A. Ventricular systole
- A. Ventricular systole
- B. Ventricular diastole
- C. Atrial systole
- D. Atrial diastole
- E. Both during atrial systole and atrial diastole
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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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