The digestive system is made up of key parts, each of which has a different function ... Stomach This is a muscular bag which mixes food and drink with acid. Pancreas This releases enzymes ...

Enzymes are substances in the body that cause and speed up crucial chemical reactions. Enzymes’ function is to help trigger bodily processes ranging from digestion to blood clotting to growth.

The findings leave pufferfishes’ loss of stomach function a mystery. It’s possible that pufferfish ... as well as the pancreatic enzymes that all vertebrates use to break down food in the intestines.

The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. Pepsin has an optimum ... Most other enzymes function within a working pH range of about pH 5-9 with neutral pH ...