What is the primary function of the gallbladder?

The primary function of the gallbladder is to store and release bile, which is produced by the liver. Bile plays a crucial role in the digestion and absorption of fats in the small intestine. When you consume a meal that contains fats, the gallbladder contracts and releases stored bile into the duodenum, allowing for effective emulsification and digestion of fats so that they can be absorbed by the body.

The other options refer to functions performed by different organs; for example, insulin production occurs in the pancreas, filtering blood is a function of the kidneys, and nutrient absorption primarily takes place in the small intestine. Understanding the specific role of the gallbladder in the digestive system highlights its importance in fat metabolism and overall digestive health.