The large intestine absorbs water from unabsorbed food, making the material more solid. The remaining waste is expelled through the anus, and the exit is regulated by the anal sphincter.
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The large intestine contributes to the digestive process primarily through the absorption of water from undigested food material. As material moves through the large intestine, water is progressively reabsorbed, transforming the semi-liquid residue from the small intestine into a more solid form. This absorption process consolidates waste material and prepares it for elimination. Additionally, the large intestine houses microorganisms that aid in the fermentation of certain indigestible carbohydrates, producing gases and contributing to the synthesis of certain vitamins. Ultimately, the large intestine ensures the efficient absorption of water and the formation of feces before their expulsion from the body through the anus.