The contractions of the heart chambers are known as heart beats which are rhythmically and regular. A human normal heart beats 72 times per minute at rest. These beast are audible and are known as heart sounds.
During the ventricular systole blood is forced against the closed AV-valves. This procedures the first heart sound LUB. Ventricular systole is followed by ventricular diastole. The high pressure developed in the aorta, tends to force some blood back towards the ventricles which closes the aorta valves. This impact of the back flow against the valves causes the second heart sound DUP.
During the ventricular systole blood is forced against the closed AV-valves. This procedures the first heart sound LUB. Ventricular systole is followed by ventricular diastole. The high pressure developed in the aorta, tends to force some blood back towards the ventricles which closes the aorta valves. This impact of the back flow against the valves causes the second heart sound DUP.
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