Blood pressure

Blood pressure

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Blood pressure: maintaining blood flow

What is (definition)

Blood pressure is the pressure that blood makes on the walls of blood vessels.


Blood pressure occurs from the contraction of the ventricles. It is larger in the aorta and large systemic arteries. As the distance to the left ventricle increases, the blood pressure decreases.

When an increase in blood volume occurs, an increase in blood pressure also occurs. The opposite also happens, that is, if the volume of the blood decreases, the pressure gets smaller.


Maintain proper functioning blood flow to meet the needs of the body.


Systolic blood pressure, diastolic blood pressure, mean blood pressure, arteriolar pressure, precapillary pressure, capillary pressure, postcapillary pressure.


- When there is a decrease in total blood volume (above 10%) as a result of bleeding, blood pressure drops to put the person at risk of death. The opposite can also happen (in case the blood volume increases, which may be due to the body retaining water). In this case, the blood pressure will increase.

Last reviewed: 12/05/2018

By Elaine Barbosa de Souza
Undergraduate student in Biological Sciences, Methodist University of São Paulo.