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The human vascular system is a transport network in which transport - blood - is in continuous motion. For blood to move, it must be under pressure. The pressure is created by the contraction of the heart muscle, as a result of which a new portion of blood is injected into the artery with each heartbeat. That is why, when measuring pressure, two values are recorded: at the moment of contraction and in a relaxed state. The higher (upper) value is called systolic pressure (systole - in Greek "contraction"), the lower (lower) value is called diastolic pressure (diastole - "expansion"). Normally, the upper value should be around 120-140 mm Hg. Art., lower - about 70-80 mm Hg. Art. For young people, lower rates are normal, for people over 40, higher rates. If the pressure measurement shows values that are higher than those indicated, then this pressure should be considered increased. A sustained increase in blood pressure is called arterial hypertension, and the patient is diagnosed with hypertension