The video explains the stomach's role in digestion, highlighting its capacity to hold food and liquid. It describes the two types of digestion—mechanical and chemical—that occur in the stomach. The mucosa layer secretes gastric juice, which contains enzymes like pepsin to break down proteins. Stomach acid, while not primarily for digestion, protects against infections by killing harmful microorganisms. The stomach's muscular contractions, known as peristalsis, mechanically break down food, increasing its surface area for enzyme action. The processed food, now called chyme, moves to the small intestine, where pancreatic alkali neutralizes the acid.

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