What is the primary function of the gallbladder?

The primary function of the gallbladder is to store bile, which is produced by the liver. Bile plays a crucial role in the digestion and absorption of fats in the small intestine. When food, especially fatty food, enters the small intestine, the gallbladder contracts and releases stored bile into the duodenum, which helps to emulsify fats, making them easier for digestive enzymes to break down. This storage function allows for a concentrated supply of bile to be available when needed, facilitating effective digestion.

The other options describe functions performed by different organs. For instance, the production of digestive enzymes primarily occurs in the pancreas and the salivary glands; absorption of water mainly takes place in the large intestine; and the secretion of insulin is a function of the pancreas, which regulates blood sugar levels. Hence, recognizing the gallbladder's specific role in storing bile is crucial in understanding the digestive system's functionality.