What is a major function of the stomach?

The primary function of the stomach is to mix and grind food while breaking it down. This is achieved through its muscular walls, which contract and churn the food, effectively blending it with gastric juices. These juices, which contain hydrochloric acid and digestive enzymes, help to further break down proteins and kill pathogens present in food. This mechanical and chemical processing creates a semi-liquid substance called chyme, which is essential for digestion to proceed in the small intestine.

In addition, while other organs in the digestive system are primarily responsible for absorbing nutrients or filtering toxins, the stomach's main role is the initial stages of digestion. This makes the mixing and grinding of food a crucial step in preparing it for nutrient absorption and digestion in subsequent parts of the gastrointestinal tract.