The digestive system is a group of organs that work together to convert food into energy and basic nutrients that will nourish the entire body. The digestive system breaks down food so that nutrients can be absorbed by the body. The digestive system has three main functions. First, it ingests food, then breaks it down so that the nutrients can be absorbed, and also eliminates what cannot be digested. During the average lifetime, up to 45 tons of food can pass through the digestive system. Food travels nearly 30 feet through a long tube inside the body known as the alimentary canal, or gastrointestinal tract. 1) Mouth: The digestion process begins in the mouth. Where the food is broken down into small pieces and these pieces can be easily absorbed.2) Pharynx: The main function of the pharynx is: It allows the passage of both air and food. The pharynx also receives food into the digestive system after being swallowed and pushes it towards the esophagus.3) Esophagus: The esophagus is a long straight tube that connects the pharynx to the stomach. Once the food has been reduced to a soft mush, the tongue pushes it towards the throat which leads to a long straight tube called the esophagus. The esophagus squeezes the mass of food with a rhythmic muscle contraction called peristalsis which then pushes the food towards the stomach.4) Stomach: The stomach squeezes and mixes the food with enzymes for hours before releasing the mixture into the small intestine. 5) Pancreas: The pancreas is an oval organ located between the stomach and the small intestine. It produces fluids to protect the small intestine from acid. It produces important enzymes and hormones that... half of the paper... ulcerec) Smoking is increased and the risk of ulcers is increased because the healing process is slow, which leads to ulcer recurrence .Normal development in the colon in vulnerable places occurs naturally under the influence of pressure, where there is a single theory explaining why the incidence of this disease is increased pressure in the colon causing weakening of the wall diverticula leading to infection or Blockage in the narrow opening of the diverticulum can reduce blood flow to the area, causing inflammation. It is a digestive system and autoimmune disorder that leads to destruction of the lining of the small intestine when you eat food that contains gluten, gluten is a form of protein found in grains and this can cause damage to the intestine and make it difficult to absorb of nutrients by the body, especially fat and iron.