The ______ is the site of complete digestion of carbohydrates, proteins and fats in the human body.
small intestine
The correct answer is small intestine.
The small intestine completes the digestion of all three classes of food. Pancreatic amylase, trypsin, chymotrypsin and lipase together with bile act in the duodenum, and brush-border enzymes (maltase, sucrase, lactase, peptidases) finish the job, giving glucose, amino acids, fatty acids and glycerol, which are absorbed through the villi.
The pharynx is only a passage, the stomach digests mainly proteins and only partially, and the large intestine absorbs water and salts.
Short trick: Complete digestion and absorption = small intestine.
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