For ingested foods, the first opportunity for enzymatic digestion occurs in the see concept 41.3 (page 903)

Answer;

The mouth

For ingested foods, the first opportunity for enzymatic digestion occurs in the mouth.

Explanation;

The digestion of food starts in the mouth.

There is both mechanical and enzymatic digestion of food in the mouth. Mechanical digestion involves the mechanical break down of food using teeth to smaller particles thus increasing the surface are for the activity by enzymes.

Enzymatic digestion in the mouth involves enzyme salivary amylase which acts on starch to form maltose.