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BLOOD PRESSURE blood pressure What is blood pressure? w hen your heart beats, it pumps blood round your body to give it the energy and oxygen it needs. As the blood moves, it pushes against the sides of the blood vessels. The strength of this pushing is your blood pressure. If your blood pressure is too high, it puts extra strain on your arteries (and your heart) and this may lead to heart attacks and strokes Tow type blood pressure 1 - systolic bp : 120/80 mm Hg. The top number refers to the amount of pressure in your arteries during the contraction of your heart muscle. This is called systolic pressure . The bottom number refers to your blood pressure when your heart muscle is between beats. This is called diastolic pressure 2 - Diastolic : Diastolic blood pressure measures the pressure on the walls of your arteries between heartbeats. A normal ...