The gallbladder is responsible for storing which substance?

The gallbladder is primarily responsible for storing bile, which is a digestive fluid produced by the liver. Bile plays a crucial role in the digestion and absorption of fats in the small intestine. When food containing fat enters the intestine, the gallbladder contracts and releases the stored bile into the digestive tract, facilitating the digestion process.

Insulin is a hormone produced by the pancreas that regulates blood sugar levels, but it is not stored in the gallbladder. Glucose is a simple sugar utilized by the body as a source of energy, and while it is transported and metabolized in various ways, it does not involve storage in the gallbladder. Chyme is a mixture of food and digestive juices that results from the digestion process in the stomach, but it does not correlate with the gallbladder's functions. Therefore, bile is the correct answer, as it is the substance that the gallbladder specifically stores for digestive purposes.