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ABOUT “BLOOD PRESSURE”
What is blood pressure?
The heart is a pump that circulates blood throughout your body. Blood is pumped
from the heart at a constant pressure into arteries. This pressure is called the
arterial blood pressure and represents, in general terms, your blood pressure.
Blood pressure is indicated by several kinds of pressures, including the systolic
pressure that occurs when the heart pumps blood and the diastolic pressure that
occurs when blood returns to the heart.
(Systolic)
(Diastolic)
Artery Artery
Left atrium
Left
ventricle
Left atrium
Left
ventricle
Dilation
The artery wall expands.
Contraction
Normal state is restored
to the artery wall.
Your blood pressure changes all the time.
Your blood pressure differs according to your age, gender and a range of other
factors. It is likely to be affected by your biorhythm during the day and by your
posture, physical activities, mental activities, level of stress and even by the air
temperature. The blood pressure of a healthy person generally varies by 20 to 50
mmHg within a day.
Blood pressure value (mmHg)
Time of day
Systolic blood pressure
Diastolic blood pressure