A clear, almost colorless fluid consisting of blood from which the red and white blood cells have been removed. Plasma contains platelets and cells called lymphocytes. The portion of plasma that diffuses out of blood vessels into open spaces of the body is called lymph. Lymph is reabsorbed by a system of lymph vessels and carried back to two points just behind the collarbones where the fluid is emptied back into the blood stream.
From How The World Works by Boyce Rensberger
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