Question

what is the role of saliva , mucus , pancreatic juice

Answer 1

Digestion. The digestive functions of saliva include moistening food and helping to create a food bolus. ... Saliva contains the enzyme amylase, also called ptyalin, which is capable of breaking down starch into simpler sugars such as maltose and dextrin that can be further broken down in the small intestine.

Answer 2

The digestive functions of salivainclude moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before foodreaches the stomach.
mucusis used as a lubricant for materials that must pass over membranes, e.g., foodpassing down the esophagus. ... A layer of mucus along the inner walls of the stomach is vital to protect the cell linings of that organ from the highly acidic environment within it.
Pancreatic enzymes break down foodin the small intestine. When foodenters the duodenum, it is deluged with pancreatic juice, which is defined as an alkaline secretion of thepancreas containing enzymes that aid in the digestion of proteins, carbohydrates and fats.