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The duodenum is a short portion of the small intestine connecting it to the stomach. It is about 10 inches (25 cm) long, while the entire small intestine measures about 20 feet (6.5 meters).
Cementum is a specialized bone like substance covering the root of a tooth. It is approximately 45% inorganic material (mainly hydroxyapatite), 33% organic material (mainly collagen) and 22% water.ementum is a specialized bone like substance covering the root of a tooth. It is approximately 45% inorganic material (mainly hydroxyapatite), 33% organic material (mainly collagen) and 22% water.