What is the primary function of the large intestine?

• A. Digest proteins
• B. Absorb nutrients
• C. Absorb water and electrolytes
• D. Produce bile

Answer: (C)

The primary function of the large intestine is to absorb water and electrolytes from the indigestible food matter that has passed through the small intestine. This process is crucial for maintaining the body’s fluid and electrolyte balance. As the chyme moves into the large intestine, the extensive surface area allows for significant absorption of water, which transforms the remaining material into more solid waste (feces) for excretion.

The large intestine also plays a role in the fermentation of some undigested carbohydrates by gut bacteria, but its main role is indeed the absorption of water and electrolytes. This function is essential in preventing dehydration and ensuring that the body retains necessary salts and fluids.