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In humans, the chemical process of digestion is initiated in the
Solution:
Chemical digestion in humans begins in the buccal cavity (mouth) with the action of salivary amylase (ptyalin), which breaks down complex carbohydrates (starch) into simpler sugars (maltose). Although mechanical digestion starts here, the question specifically asks about the chemical process. The oesophagus is primarily a transport tube. In the stomach, protein digestion begins, and in the small intestine, the digestion of carbohydrates, proteins, and fats is completed.