Which one of the following is a 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 fibres - Initiation of the heart beat.

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