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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.
The Human Digestive System. In the digestive system, ingested food is converted into a form that can be absorbed into the circulatory system circulatory system,group of organs that transport blood and the substances it carries to and from all parts of the body.ost food, however, is not absorbed in the stomach and passes into the duodenum (first section of the small intestine) in the form of a thick liquid called chyme. Digestive enzymes from the pancreas pancreas, glandular organ that secretes digestive enzymes and hormones.