- the pressure of the blood against the inner walls of the blood vessels, varying in different parts of the body during different phases of contraction of the heart and under different conditions of health, exertion, etc. Abbr.: BP Cf. diastolic, systolic.[1870-75]
* * *Their stretching and contraction help maintain blood flow. Usually measured over an arm or leg artery in humans, blood pressure is expressed as two numbers; normal adult blood pressure is about 120/80 mm of mercury. The higher number (systolic) is measured when the heart's ventricles contract and the lower (diastolic) when they relax. See also hypertension, hypotension.
* * *force originating in the pumping action of the heart, exerted by the blood against the walls of the blood vessels; the stretching of the vessels in response to this force and their subsequent contraction are important in maintaining blood flow through the vascular system. In human beings, blood pressure is usually measured indirectly over the brachial or femoral artery: the highest (systolic) pressure, normally about 120 (100 to 140) millimetres of mercury, occurs during contraction of the ventricles; the lowest (diastolic) pressure, normally about 80 (60 to 100) millimetres, occurs during ventricular relaxation. Blood pressure in the capillaries is usually about 20 to 30 millimetres, while the pressure in the large veins may become negative (lower than atmospheric pressure).Arterial blood pressure varies among individuals and in the same individual from time to time. It is lower in children than in adults and increases gradually with age. It tends to be higher in those who are overweight. During sleep it decreases slightly, and during exercise and emotional excitement it increases. See also hypertension; hypotension.
* * *
Look at other dictionaries:
blood pressure — blood .pressure n [U] the force with which blood travels through your body ▪ high blood pressure check/take sb s blood pressure (=measure it) ▪ The nurse will take your blood pressure … Dictionary of contemporary English
blood pressure — blood ,pressure noun uncount the pressure at which blood flows from your heart around your body. Blood pressure that is either very high or very low can be dangerous to your health … Usage of the words and phrases in modern English
blood pressure — n. the pressure exerted by the blood against the inner walls of the blood vessels, esp. the arteries, or the heart: it varies with health, age, emotional tension, etc … English World dictionary
blood pressure — ► NOUN ▪ the pressure of the blood in the circulatory system, which is closely related to the force and rate of the heartbeat … English terms dictionary
Blood pressure — For information about high blood pressure, see Hypertension. Blood pressure Diagnostics A sphygmomanometer, a device used for measuring arterial pressure. MeSH … Wikipedia
Blood pressure — The blood pressure is the pressure of the blood within the arteries. It is produced primarily by the contraction of the heart muscle. It s measurement is recorded by two numbers. The first (systolic pressure) is measured after the heart contracts … Medical dictionary
blood pressure — noun the pressure of the circulating blood against the walls of the blood vessels; results from the systole of the left ventricle of the heart; sometimes measured for a quick evaluation of a person s health (Freq. 2) adult blood pressure is… … Useful english dictionary
blood pressure — the pressure of blood against the walls of the main arteries. Pressure is highest during systole, when the ventricles are contracting (systolic pressure), and lowest during diastole, when the ventricles are relaxing and refilling (diastolic… … The new mediacal dictionary
blood pressure — The force of circulating blood on the walls of the arteries. Blood pressure is taken using two measurements: systolic (measured when the heart beats, when blood pressure is at its highest) and diastolic (measured between heart beats, when blood… … English dictionary of cancer terms
blood pressure — noun a) The pressure exerted by the blood against the walls of the arteries and veins; it varies during the heartbeat cycle, and according to a persons age, health and physical condition. the great majority of people who have serious conditions… … Wiktionary