Pressure changes during the cardiac cycle. Ventricle systole. Atrial systole. N. L. P. Diastole. What is happening at L-M. L: Ventricular systole starts Ventricular pressure greater than atrial pressure. Therefore AV valves shut. M: Ventricular systole
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L: Ventricular systole starts
Ventricular pressure greater than atrial
Therefore AV valves shut.
M: Ventricular systole
Pressure in ventricle exceeds that in aorta
Semilunar valves open
Blood enters aorta.
N: Start of ventricular diastole
Ventricular pressure less than aortic pressure
Semilunar valves shut
Preventing backflow of blood into ventricles
P: Ventricular diastole
Pressure in ventricle drops below atrium
AV valves open
Blood enters ventricle