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Which one of the following is a matching pair

  • Lubb - Sharp closure of AV valves at the beginning of ventricular systole

  • Dup - Sudden opening of semilunar valves at the beginning of ventricular diastole

  • Pulsation of the radial artery - Valves in the blood vessels

  • Initiation of the heart beat - Purkinje fibres

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