Which of the following organs is NOT part of the digestive system?

The bladder is not part of the digestive system; it is a component of the urinary system. The primary function of the bladder is to store urine before it is excreted from the body. In contrast, the liver, stomach, and esophagus are all integral parts of the digestive system, which is responsible for the breakdown and absorption of food.

The liver plays a crucial role in processing nutrients absorbed from the digestive tract and producing bile, essential for digestion. The stomach is responsible for breaking down food through mechanical and chemical processes while the esophagus serves as the conduit for food from the mouth to the stomach. Understanding the distinct functions of these organs helps clarify their roles in body systems, particularly separating those related to digestion from those related to urination.