Question

Which one of the following is a correct matching pair?

• A. Lubb - Sharp closure of AV valves at the beginning of ventricular systole
• B. Dup - Sudden opening of semilunar valves at the beginning of ventricular diastole
• C. Pulsation of the radial artery - Valves in the blood vessels
• D. Purkinje fibers - Initiation of the heart beat

Answer 1

The correct option is A Lubb - Sharp closure of AV valves at the beginning of ventricular systole

First sound of heart is lubb (a long and booming sound), created by the closure of atrioventricular valves (AV), tricuspid and bicuspid at the beginning of ventricular systole. the second sound of heart is dupp which is short and sharp. The instrument used to hear heart sound is stethoscope.