Hypertension
The pressure ruling in the arteries and the result of an interplay of cardiac activity and blood vessels is blood pressure. Two values which correspond to pulling together (systole) and tiring (diastole) the heart have to be distinguished at the blood pressure. One therefore talks about the systolic (upper) and diastolic (lower) pressure.
The blood circulation has the important task of permanently providing all organs (e.g. heart, brain, kidneys, liver etc.) and tissues (e.g. musculature, skin etc.) with blood. The heart is for this of greatest importance because it keeps the blood in motion as a pump. To this end the heart usually works in a regular rhythm of 60-80 beats per minute. At every beat at first the heart contracts (systole) and the blood presses into the blood circulation.
Then the heart extends and fills so with blood (diastole) which is cast again at the following beat. This blood flows arteries (arteries) branching of the heart through themselves into the organs and tissues. There the blood vessels get gradually so fine that they offer a considerable resistance to the bloodstream so that the blood can only flow through them under a high pressure.
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