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The mononuclear phagocyte system constitutes macrophage cells spread throughout the human body. The macrophages are long-lived cells that provide a major defense system against hostile elements through phagocytosis and subsequent intracellular destruction of the particle or cell.
A monosaccharide is a monomer of carbohydrates. Five monosaccharides are important in the body. Three of these are the hexose sugars, so called because they each contain six atoms of carbon. These are glucose, fructose, and galactose, shown in [link]a. The remaining monosaccharides are the two pentose sugars, each of which contains five atoms of carbon.