Digestive enzyme

Food consists of macromolecules of proteins, carbohydrates, and fats that need to be broken down chemically by digestive enzymes in the mouth, stomach, pancreas, and duodenum, before being able to be absorbed into the bloodstream.

Once in the stomach further mechanical churning takes place mixing the food with secreted gastric acid.

In the oral cavity, salivary glands secrete an array of enzymes and substances that aid in digestion and also disinfection.

The following are enzymes produced by the stomach and their respective function: Pancreas is both an endocrine and an exocrine gland, in that it functions to produce endocrinic hormones released into the circulatory system (such as insulin, and glucagon), to control glucose metabolism, and also to secrete digestive / exocrinic pancreatic juice, which is secreted eventually via the pancreatic duct into the duodenum.

The pancreas's exocrine function owes part of its notable reliability to biofeedback mechanisms controlling secretion of the juice.

In some plants, the leaf collapses on the prey to increase contact, others have a small vessel of digestive liquid.