It was the ancient Greeks who first divided the 20-foot length of the small intestine into three parts: The duodenum, the jejunum and the ileum.
However, the organ may finally be ready for an update: U.S. researchers say the small intestine is actually comprised of five distinct segments, each being responsible for the absorption of various nutrients.
According to the researchers, their work examined the "geography" of the small intestine across multiple species, including mice and humans. Overall they tracked thePart of their investigation was genetic: Zwick and her colleagues identified genes that appeared to be responsible for nutrient absorption at various spots along the small intestine.
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