Blood pressure without further specification usually refers
to the systemic arterial pressure measured at a person's upper arm and is a
measure of the pressure in the brachial
artery, the major artery in the upper arm. A person’s blood pressure is
usually expressed in terms of the systolic pressure over diastolic pressure and
is measured in millimetres of mercury (mm Hg), for example
120/80. It is also expressed as the amount over normal atmospheric pressure
(760 mm Hg), so a blood pressure of 120 mm Hg would actually be
880 mm Hg of true pressure.
to the systemic arterial pressure measured at a person's upper arm and is a
measure of the pressure in the brachial
artery, the major artery in the upper arm. A person’s blood pressure is
usually expressed in terms of the systolic pressure over diastolic pressure and
is measured in millimetres of mercury (mm Hg), for example
120/80. It is also expressed as the amount over normal atmospheric pressure
(760 mm Hg), so a blood pressure of 120 mm Hg would actually be
880 mm Hg of true pressure.
Blood pressure varies in healthy people and animals, but its
variation is under control by the nervous and endocrine systems. Blood pressure
that is pathologically
low is called hypotension, and that which is pathologically high is hypertension.
Both have many causes and can range from mild to severe.
variation is under control by the nervous and endocrine systems. Blood pressure
that is pathologically
low is called hypotension, and that which is pathologically high is hypertension.
Both have many causes and can range from mild to severe.
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