The small intestine is an organ of the digestive system that has the job of absorbing the nutrients and minerals from the food and liquid a person takes. It runs from the stomach to the opening of the large intestine and has a length of 20 feet and has a diameter of about an inch. 90% of digestion takes place in the small intestine and the remaining 10% happens in the large intestine and stomach.
When the food we eat reaches the small intestine, nutrients from it get absorbed by the small intestine’s inner walls that will make their way into the bloodstream. When this organ is infected and not functioning well, a human might get sick due to malnutrition.