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Unformatted text preview: gether­they contract out of sync. This enables the muscles to mix and churn the food in the body of the stomach. The mixing is with water, hydrochloric acid (produced in the stomach), and pepsin. This mixture is known as CHYME. The release of the chyme is regulated by the pyloric sphincter. The stomach also has longitudinal folds within the lumen. These folds, called RUGAE, increase the surface area of the stomach. Small Intestine Small Intestine 3 parts: 1. Duodenum ­ 10 inches long 2. Jejunum ­ 8 feet long 3. Ileum ­ 11 feet long mesentery The small intestine produces 7 enzymes. There are a total of 17 enzymes that are dumped into the duodenum for digestion. The small intestine is the area where most digestion occurs. It is also the place where 74% of the absorption of nutrients occur. The absorptive area is increased by: 1. circular folds called PLICAE CIRCULARIS. 2. Microscopic VILLI 3. MICROVILLI These structures increase the surface area of the small intestine by 600x Within the plicae circularis a...
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