The primary organ for digestion in humans is the stomach. Located in the upper abdomen, the stomach is responsible for breaking down food using gastric juices and enzymes, allowing nutrients to be absorbed later in the intestines. After food is swallowed, it travels down the esophagus and enters the stomach, where it mixes with digestive acids and continues the breakdown process. The stomach's muscular walls also help to churn the food, facilitating further digestion. Once partially digested, the food passes into the small intestine, where more nutrient absorption occurs, highlighting the stomach's crucial role in the digestive system.