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There are at least four hormones that aid and regulate the digestive system:

Gastrin - it is in the stomach and stimulates the gastric glands to secrete pepsinogen and hydrochloric acid.

 

Secretin -  it is in the duodenum and signals the secretion of sodium bicarbonate in the pancreas and it stimulates the bile secretion in the liver.

 

Cholecystokinin - it is in the duodenum and stimulates the release of digestive enzymes in the pancreas and stimulates the emptying of bile in the gall bladder. This hormone is secreted in response to fat in chyme.

 

Gastric inhibitory peptide - it is in the duodenum and decreases the stomach churning in turn slowing the emptying in the stomach. Another function is to induce insulin secretion

 

Pancreozymin hormone stimulates the pancreas to secrete the enzyme portion. In addidion, hormones like insulin and glucagon also help in food digestion.

 

Starch digestion is carried out by amylase and maltase enzymes. Protien digestion is carried out by several enzymes such as pepsin, trypsin, enterokinase and chymotrypsin. The digestion of fats is carried out by several lipases.