Human Digestive System

Human Digestive System

PRESENTED BY

: Ravinder Pal

GUIDED BY

: Alka Rani Sharma (Teacher Trainer)

Human Digestive System -A Brief

Introduction

Digestive System, series of connected organs whose purpose is to break down, or digest, the food we eat. Food is made up of large, complex molecules, which the digestive system breaks down into smaller, simple molecules that can be absorbed into the bloodstream.

The Esophagus

Esophagus 

The esophagus, a muscular tube about 25 cm (10 in) long, passes behind the trachea and heart and penetrates the diaphragm (muscular wall between the chest and abdomen) before reaching the stomach. The process begins when circular muscles in the esophagus wall contract and relax (widen) one after the other, squeezing food downward toward the stomach. Food travels the length of the esophagus in two to three seconds.

STOMACH

Located on the left side of the body, under the diaphragm, the stomach is a muscular, saclike organ that connects the esophagus and small intestine. Its main function is to break down food.

Small Intestine Small intestine is where most digestion takes place. The inner lining, or mucosa, is folded and covered with tiny finger-like projections called villi, a design that maximizes the absorptive surface area of the intestine. Rhythmic contraction of the muscular walls moves food along while bile, enzymes, and other secretions break it down. Nutrients absorbed into the intestine’s many blood vessels are carried to the liver to be distributed to the rest of the body..

Describe journey into small intestine

Large Intestine

Large Intestine( Cont…) Anchored in the abdomen, the large intestine is the final section of the digestive tract. Undigested material passes from the small intestine as liquid and fiber. The muscular walls of the large intestine push this material through the intestine into the rectum. Cells in the smooth walls absorb vitamins, minerals, and water. Condensed waste, called feces, leaves the body through Anus.

Ailments Of Digestive System :     

Mumps Ulcers Diarrhea Appendicitis Constipation