What is the primary function of the stomach?

• A. Store food, churn, and begin digestion
• B. Absorb nutrients directly into the bloodstream
• C. Regulate water balance
• D. Neutralize stomach acid

Answer: (A)

The stomach’s main purpose is to store food, mix it with gastric juices, and start digestion. Its muscles churn the contents to turn it into a semi-liquid chyme, while glands release acid and enzymes—acid provides the acidic environment and helps activate the enzyme pepsin, which begins protein digestion. This combination prepares the food for the small intestine, where most digestion and absorption occur. Absorbing nutrients into the bloodstream is mainly a small-intestine job, with only limited absorption in the stomach. Water balance and neutralizing stomach acid aren’t primary stomach functions—the stomach stays acidic to aid digestion, and neutralization happens later in the small intestine.