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Definition of Pressor

Pressor: Causing a rise in blood pressure.

A pressor base is a substance (chemically classified as a base) capable of raising the blood pressure.

A pressor nerve is a nerve that, when stimulated, increases the blood pressure.

A pressor reflex is a nerve reflex that constricts arterioles (small blood vessels) and thereby increases the blood pressure.

A pressor substance is any substance that elevates arterial blood pressure. For example, prostacyclin (also known as prostaglandin PGI2) is a potent pressor agent.

The word "pressor" comes from the French verb "presser" meaning "to exert pressure" or "to squeeze."

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=9565
Last Editorial Review: 6/14/2012

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