Describe the structure and function of the small intestine.
结合小肠的结构特点，说明小肠的消化吸收功能。
In control group, the small intestine epithelium microvilli arranged neatly, the mitochondrial structure were normal, and the epithelium cell were integrity.
空白对照组小肠吸收上皮细胞微绒毛排列整齐，线粒体结构正常，细胞器完整。
In control group, the small intestine epithelium microvilli arranged neatly, the mitochondrial structure were normal, and the epithelium cell were integrity.
空白对照组小肠吸收上皮细胞微绒毛排列整齐，线粒体结构正常，细胞器完整。
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