Blood velocities in arteries are higher during systole than during diastole. During diastole, the ventricular pressure falls from the peak reached at the end of systole. These two phases are commonly understood as systole and diastole. An imaging technique that subtracts two fast spin echo sequences acquired at systole and diastole. It is widely assumed that reflections are minimal during late diastole and early systole. The timing of the pumping procedure can be divided into two parts&colon; diastole and systole. When ventricular systole ends, pressure in the left ventricle rapidly drops. Elevated afterload (commonly measured as the aortic pressure during systole) reduces stroke volume. There are no atrial inlet valves to interrupt blood flow during atrial systole. Ventricular systole is the origin of the pulse. Back flow of blood through its opening during atrial systole is prevented by Thebesian valve. Fractional shortening (FS) is the fraction of any diastolic dimension that is lost in systole. A murmur that lasts throughout the whole of systole is known as a holo-systolic murmur. Pressure waves generated by the heart in systole move the arterial walls. Elevating Ca concentration to a high enough level results in cardiac arrest in systole.