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CBSE Class 11 Biology - Structure of the small intestine In this article, we are discussing ‘the structure of the small intestine’ from  Class 11 Biology  in order to understand the function of the small intestine in digestion and mainly absorption. STRUCTURE OF SMALL INTESTINE :  The majority of digestion and absorption of nutrients takes place in the small intestine. Absorption  is the passage of digested food material through the lining of the intestine into the blood or lymph.  Lymph  is a colorless fluid containing white blood cells (WBC) that circulate through our body tissues. The WBC present in lymph helps to fight any infection that enters our body. The small intestine has four tissue layers: The  serosa  is the outermost layer of the intestine. The serosa is a smooth membrane consisting of a thin layer of cells that secrete serous fluid and a thin layer of connective tissue.  Serous fluid  is a lubricating fluid that reduces friction from the movement of the  m