Which organ is responsible for storing and concentrating bile?

The gallbladder is specifically designed to store and concentrate 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 containing fats enters the small intestine, the gallbladder releases bile to assist in breaking down these fats, making them easier for the body to absorb. The ability of the gallbladder to concentrate bile allows it to become more effective in its digestive function.

Other organs mentioned in the choices do have important functions, but they are not focused on the storage and concentration of bile. The liver produces bile, the pancreas secretes digestive enzymes and hormones but does not store bile, and the kidneys are involved in filtering blood and producing urine, unrelated to bile storage. Understanding the specific functions of these organs helps clarify why the gallbladder is the correct answer.