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