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The mucosa of small intestine forms many circular walls and small intestinal villi to increase the interface with .
The mucosa of small intestine forms many circular walls and small intestinal villi to increase the interface with .
正确答案：food
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动物解剖生理
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The is short and straight. The boundary between the jejunum and the ileum is marked by the line between the flattened ends of the cecum.
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The cecum is cylindrical and located in the iliac region.