What is the function of the large intestine?

The large intestine plays a crucial role in the digestive system, primarily by absorbing water and forming solid waste. After food has been processed in the stomach and small intestine, it moves into the large intestine, where the remaining indigestible food is further broken down. The large intestine's mucosa absorbs water and electrolytes, which helps to consolidate the waste material into a more solid form, ultimately resulting in feces. This process is vital for maintaining the body’s fluid balance and for the efficient elimination of waste.

The other functions listed in the options pertain to different organs or systems. The absorption of nutrients occurs mainly in the small intestine, where enzymes break down food further and facilitate nutrient uptake. Bile production is the function of the liver, which stores bile in the gallbladder until needed for fat digestion in the small intestine. Filtration of blood is primarily performed by the kidneys, which remove wastes and excess substances from the bloodstream to produce urine. Understanding the specific functions of each part of the digestive system helps clarify the unique and essential role that the large intestine plays in maintaining overall digestive health.