What is blood pressure?
Blood
is carried from the heart to all parts of your body in vessels
called arteries. Blood pressure is the force of the blood
pushing against the walls of the arteries. Each time the
heart beats (about 60-70 times a minute at rest), it pumps
out blood into the arteries. Your blood pressure is at its
highest when the heart beats, pumping the blood. This is
called systolic pressure. When the heart is at rest, between
beats, your blood pressure falls. This is the diastolic
pressure.
Blood
pressure is always given as these two numbers, the systolic
and diastolic pressures. Both are important. Usually they
are written one above or before the other, such as 120/80
mmHg. The top number is the systolic and the bottom the
diastolic. When the two measurements are written down, the
systolic pressure is the first or top number, and the diastolic
pressure is the second or bottom number (for example, 120/80).
If your blood pressure is 120/80, you say that it is "120
over 80."Blood
pressure changes during the day. It is lowest as you sleep
and rises when you get up. It also can rise when you are
excited, nervous, or active.
Still,
for most of your waking hours, your blood pressure stays
pretty much the same when you are sitting or standing still.
That level should be lower than 120/80. When the level stays
high, 140/90 or higher, you have high blood pressure. With
high blood pressure, the heart works harder, your arteries
take a beating, and your chances of a stroke, heart attack,
and kidney problems are greater.
What
is blood pressure?
What is normal blood pressure?
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