Blood pressure is the force of the blood exerted on the walls on the blood vessels. The blood pressure in the arteries is the highest during ventricular systole when the blood is forced into the arteries. It decreases during ventricular diastole. Blood pressure varies in different parts of the body, being highest near the aortic arch and becoming weaker further away the arteries are from the heart. It is low in veins and it reaches 0 mm of mercury in the venae cavae, just before the venae cavae open into the right atrium of the heart.
Blood pressure is not fixed but varies from one person to the other. An average person has a systolic pressure ranging from 120 to 140 mm of mercury and a diastolic pressure ranging from 75 to 90 mm of mercury. High blood pressure may occur temporarily even in normal people, e.g. after a heavy exercise or when they are angry. However a persistent high blood pressure which may occur in middle aged or elderly people is a dangerous condition, though it is easily controlled if medical advice is sought in time and scrupulously followed. A person's blood pressure can be measure by an instrument called sphygmomanometer.
Blood pressure is not fixed but varies from one person to the other. An average person has a systolic pressure ranging from 120 to 140 mm of mercury and a diastolic pressure ranging from 75 to 90 mm of mercury. High blood pressure may occur temporarily even in normal people, e.g. after a heavy exercise or when they are angry. However a persistent high blood pressure which may occur in middle aged or elderly people is a dangerous condition, though it is easily controlled if medical advice is sought in time and scrupulously followed. A person's blood pressure can be measure by an instrument called sphygmomanometer.
