What is the function of the gallbladder?

The gallbladder primarily functions to store and release bile, which is produced by the liver. Bile is essential for the digestion and absorption of fats in the small intestine. When fatty food enters the digestive tract, the gallbladder is stimulated to contract and release the stored bile into the duodenum, where it emulsifies fats, aiding in their digestion. This function is crucial for effective fat metabolism and absorption of fat-soluble vitamins (A, D, E, and K).

The other functions listed do not pertain to the gallbladder. For instance, the production of digestive enzymes is mainly carried out by the pancreas, while nutrient absorption occurs in the small intestine. Blood filtration is a role of the kidneys. Hence, the gallbladder's specialized role in bile storage and release is vital for proper digestive function.