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The large intestine is wider in diameter and shorter in length compared to the small intestine. It primarily absorbs water and electrolytes from undigested food, while the small intestine is responsible for digestion and nutrient absorption. Additionally, the large intestine houses a large population of bacteria that aid in the fermentation of undigested materials.
Length of the large intestine is only 50 inches. The length of the small intestine is about 20 feet. Still the former is called as large intestine. It is because the diameter of the intestine is very large as compared to small intestine.
Bacteria in the large intestine can produce important vitamins for the body. For example, some bacteria produce vitamin K from eating fiber. Some bacteria also produce vitamin D.
The intestines, but water reabsorption occurs mostly in the lower small intestines. Feces formation along with some more fluid absorption occurs in the colon of the large intestines. But the large intestines' primary job is to compact liquid waste into solid waste.
Materials enter the large intestine through the ileocecal valve, which is located between the small intestine and the large intestine. It helps regulate the flow of material from the small intestine into the large intestine.