The gallbladder stores which substance produced by the liver?

The gallbladder serves the specific function of storing bile, which is a digestive fluid produced by the liver. Bile is composed of bile salts, bilirubin, cholesterol, and electrolytes, and it plays a crucial role in the digestion and absorption of fats in the small intestine. When food containing fat enters the digestive system, the gallbladder releases bile into the small intestine to aid in the emulsification of fats, facilitating their breakdown and absorption.

The other substances listed—cholesterol, insulin, and glycogen—are not stored in the gallbladder. Cholesterol is a lipid that is produced by the liver and found in the body, but it is not stored in the gallbladder. Insulin is a hormone produced by the pancreas that regulates blood sugar levels and is not related to the gallbladder's function. Glycogen, a form of energy storage in animals, is primarily stored in the liver and muscles, rather than in the gallbladder. Thus, the gallbladder's main role is specifically associated with bile storage and release.