Question

When are the sounds "LUBB" and "DUP" produced respectively during heart beat?​

Answer 1

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• The first sound LUBB is produced when the atrio-ventricular valves i.e. tricuspid and bicuspid valves close at the start of ventricular systole.
• The second sound DUP is produced at the beginning of ventricular diastole, when the pulmonary and aortic semilunar valves close.

Answer 2

Answer:

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• The first sound LUBB is produced when the atrio-ventricular valves i.e. tricuspid and bicuspid valves close at the start of ventricular systole.
• The second sound DUP is produced at the beginning of ventricular diastole, when the pulmonary and aortic semilunar valves close.