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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.
Chemical Digestion-Many glandular structures, dispersed  throughout the body, are involved in breaking food into simple  molecules that can be absorbed. In the mouth, the salivary glands  produce saliva, which both lubricates food and begins the process  of starch digestion.