Question

Which one of the following is a matching pair? (1)Lubb-sharp closure of AV valves at the beginning of ventricular systole (2)Dup-sudden opening of semilunar valves at the beginning of ventricular diastole (3)Pulsation of the radial artery-valves in the blood vessels (4)Initiation of the heart beat-Purkinje fibres

Answer 1

Explanation:

option no.4 is the correct answer