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The term blood pressure is used to describe pressure in the aorta. Blood pressure is at its highest when the ventricles contract (systolic pressure). The lowest (diastolic pressure) is when the ventricles relax. Blood pressure is measured in millimetres of mercury. For the average human the normal blood pressure are 120mm Hg for systolic pressure and 80mm Hg for diastolic. A rise in blood pressure means the heart is overworking and this can put strain on the circulatory system. On the other hand a fall can effect the organs (e.g. kidneys). So it is very important blood pressure is kept within the normal limits. High blood pressure is also called hypertension. It is a condition in which the blood pressure in the arteries is abnormally high. The pumping of the heart creates blood to move along and against the walls of the blood vessels, which are flexible enough to dilate...

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