What is the primary function of the gall bladder?

The primary function of the gall bladder is to store bile. Bile is a digestive fluid produced by the liver that aids in the emulsification and digestion of fats in the small intestine. When food, particularly fatty food, enters the small intestine, the gall bladder contracts and releases stored bile into the duodenum to assist in digestion. This function is crucial for proper fat digestion and absorption of fat-soluble vitamins.

In contrast, the other options pertain to different organs or functions: filtering blood is primarily the role of the kidneys, producing insulin is a function associated with the pancreas, and absorbing nutrients mainly occurs in the small intestine. Each of these processes is vital for overall health, but they do not pertain to the gall bladder’s specific role in the digestive system.