Answer-‘Lubb-dupp’ sound is produced due to the action of

The heart produces the lubb-dupp sound. The lubb sound is due to the closing of atrioventricular AV valves, and the dupp sound is due to the closure of semilunar valves during the cardiac cycle. Information Booster The heartbeat is a rhythmic contraction and relaxation of the heart muscles. The sounds are diagnostic indicators of heart health. A stethoscope amplifies these sounds for clinical analysis.