Question

During ventricular systole blood flows starts in body ?

• A. Just after the onset of systole
• B. $0.05$ sec. after the onset of systole
• C. $0.10$ sec. after the onset of systole
• D. Just before the T wave of ECG

Answer 1

The correct option is B $0.05$ sec. after the onset of systole

Correct option is : B

Immediately after ventricular contraction begins, the ventricular pressure rises abruptly causing atrio-ventricular valves to close. Then an additional 0.02-0.03 seconds is required for the ventricles to build up sufficient pressure to push the semi-lunar valves open. This period of contraction without emptying is known as isometric contraction. This is followed by rapid ejection of blood.