Blood pressure is the measure of the force of the blood against the walls of the blood vessels that it is contained in.

Blood pressure is usually expressed in mmHg as the systolic pressure divided by the diastolic pressure.

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force/pressure

Diastolic Blood Pressure

Blood pressure is is sometimes called arterial blood pressure. It is caused by circulating blood on the walls of arteries. When the heart beats, it does not have a constant pressure. It rests slightly in between beats. There is a maximum called systolic and a minimum called diastolic. The pressure is measured in the upper arm at the brachial artery. The BP is expressed in systolic pressure over diastolic pressure in millimeters of mercury (mmHg) and normal blood pressure for an adult is 120/80.