Question

Time interval between DUP and LUBB is ______ coincide with _____

• A. $0.3$ sec, ventricular systole
• B. $0.3$ sec, joint diastole and atrial systole
• C. $0.4$ sec, joint diastole
• D. $0.4$ sec, atrial systole

Answer 1

The correct option is A $0.3$ sec, ventricular systole

Closing of AV valves produces 'lubb' and the closure of semilunar valves produces 'dubb'. This happens during ventricular systole when blood from ventricles is drained into the aorta and pulmonary artery. The time interval between the closure of these two valves is approx. 0.3 sec.

So, the correct option is A.