Eosinophil - Definition

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Eosinophils are a type of white-cell (white blood cell). More precisely, they belong with neutrophils and basophils, in the category of granulocytes, once called "polynuclear cells". Eosinophils represent only 1 to 5% of the totality of white blood cells, and have a lifespan of 6 to 12 hours in the blood and about ten days in the tissues. They play an important role in the immune defense process, especially in attacking parasites in the organism.


Granulocytes or eosinophils are blood cells that play a role in the immune system. These are a variety of white blood cells or leukocytes. They are called eosinophils because they set eosin and take its red color when color is involved. They contain toxic substances that they use against parasites. When their levels increase, which is visible on a blood test with a blood count, a parasitic disease, allergy, leukemia, skin or inflammatory diseases may be suspected.