"lubb" sound is produced due to___________________?
Correct answer: B. Closure of inlet valve
- A. Opening of inlet valve
- B. Closure of inlet valve
- C. Opening of outlet valve
- D. Closure of outlet valve
Explanation
The lubb sound occurs when the atrioventricular, or inlet, valves close at the beginning of ventricular systole. Their closure prevents backflow into the atria, whereas closure of the outlet valves produces the dubb sound, making d the likely error.
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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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