![]() Diastolic pressure – the second number (80 mmHg in the example) is the pressure of the blood when the heart is at rest between heart beats (diastole).Systolic pressure – the first number (120 mmHg in the example) is the pressure of the blood during the heart contraction (systole). ![]() ![]() 120/80 mmHg), measured in “millimetres of mercury (mmHg)”: The body tries to maintain a stable blood pressure through the process of homeostasis.īlood pressure is measured using an automated blood pressure monitor, or manually using a stethoscope and sphygmomanometer. There is a range of normal blood pressures that are considered acceptable. The blood pressure of each individual is slightly different and can change throughout the day depending on activity. It is influenced by a vast number of variables depending on the body’s demand. The body’s blood pressure is a measure of the pressures within the cardiovascular system during the pumping cycle of the heart.
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