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The diagram shows the human gut. Which numbered structures secrete digestive enzymes?

A. 1, 2, 3 and 4 B. 1, 2, 3 and 6 

C. 2, 3, 4 and 5 D. 2, 3, 5 and 6

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Digestive enzymes are secreted by salivary glands (salivary amylase), stomach (pepsin), pancreas (amylase, lipase) and small intestine (trypsin). Liver produces bile juice and it only emulsifies (breaks down) fats and does not digest them.

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