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The small intestine is a long, highly convoluted tube in the digestive system that absorbs about 90% of the nutrients from the food we eat. It is given the name âsmall intestineâ because it is only 1 inch in diameter, making it less than half the diameter of the large intestine.
Absorption occurs in the digestive system when the nutrients move from the gastrointestinal tract to the blood or lymph. Defecation is the process of expelling what the body couldn't use.itamin c). Once the chyme leaves the small intestine, most of the nutrients have been absorbed and only waste products and water remain; this is called liquid stool.   The small intestine is where the majority of food digestion occurs.