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The small intestine is where most chemical digestion takes place. Many of the digestive enzymes that act in the small intestine are secreted by the pancreas and enter the small intestine via the pancreatic duct.he small intestine is where most chemical digestion takes place. Many of the digestive enzymes that act in the small intestine are secreted by the pancreas and enter the small intestine via the pancreatic duct.
Digestion only takes place within the digestive tract. The digestive tract begins with the mouth and ends with the anus. Digestion of food in humans is a process that occurs inside of cells. Digestive enzymes are secreted into the tract by glands located either in the tract or nearby. Food is never found within accessory glands, only within the tract itself.