How the heart works

Working like a bomb, the heart contracts and expands. Putting your ear to a colleague's chest, for example, you should easily hear the heartbeat.

The contraction of the heart musculature is called systole, relaxation is called diastole. First, atrial systole occurs: blood passes to the ventricles. Then ventricular systole occurs: blood is drawn into the pulmonary arteries and into the aorta. After systole, cardiac muscle diastole occurs in the atria and ventricles: the atria fills with blood and the systole process begins again.

Alternating neatly, the systole and the diastole They are responsible for the flow of blood within the blood vessels.

Measured blood pressure is the pressure exerted by the blood on the aortic walls after it is released by the left ventricle. It is different in systole and ventricular diastole.

The maximum arterial pressure corresponds to the moment when the left ventricle pumps blood into the aorta and the aorta is distended. Already the minimum blood pressure is the one that occurs at the end of left ventricular diastole.

The maximum arterial pressure corresponds to 120 mm of mercury, while the minimum arterial pressure corresponds to 80 mm of mercury. These are the normal values ​​for the population. Hence talk of 120 by 80 or 12 by 8 for normal pressure.

Through a device called sphygmomanometer, blood pressure can be measured by a doctor or a qualified practitioner. The value of blood pressure is an important data in the assessment of the health conditions of the cardiovascular system.