How does our nervous system work?

The process of digestion commences at the sight of good food ,dressed salads etc ,because of the secretions of certain enzymes by our endocrine system .The process of digestion starts in bulk with the grinding of food by our teeth (grinders ).Here in the mouth itself the saliva mixes with the food particles and the food then reaches the esophagus(food pipe ).From here it reaches the abdomen of which certain glands seceretes digestive juices .The abdominal walls contracts and expands and the food gets converted into a thick solution (lapsi) .The digestive juices partially digests the food aswell .
From abdoman the semidigested food reaches in the small intestine .Here it combines with secretions from The Liver and Pan -creas .The food gets digested and the digested food is absorbed by the walls of the small intestines .
Note :The pan-creas releases insulin which not only burns the sugars that be acts as a gate for body cells and energy reaches each of the biliions of cells .