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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 takes place whenever and wherever food comes into contact with digestive enzymes. Salivary glands at the base of the tongue secrete enzymes that begin the digestion of carbohydrates. Enzymes secreted by the lining of the stomach are involved in protein, fat and milk digestion.