![Which one of the following is a matching pair?](https://www.gkseries.com/blog/wp-content/uploads/2022/04/Which-one-of-the-following-is-a-matching-pair.png)
Q. Which one of the following is a matching pair?
A. Luub- sharp closure of AV valves at the beginning of ventricular systole
B. Dup- sudden opening of semilunar valves are the beginning of ventricular diastole
C. pulsation of the radial artery-valves in the blood vessels
D. initiation of heart beat- purkinje fibres
Answer: Luub- sharp closure of AV valves at the beginning of ventricular systole