Which structures of the digestive system, aside from the small intestine, release substances that help break down food in the small intestine?.

Pancreas, stomach, gall bladder, among other things (if any).

Explanation:

The pancreas releases enzymes such as trypsin and chymotrypsin to digest proteins into the duodenum. (This process is overly simplified for your convenience). The stomach itself manufactures hydrochloric acid (HCl) via parietal cells which help in chemical denaturation. The gall bladder houses bile, manufactured by the liver, which is released into the duodenum when fatty food is detected. The bile serves to emulsify the fat, to aide in digestion.

Again, all these processes are simplified, but if you are in an advanced class you should look up the mechanisms of release and other processes that may be needed. Good luck!

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