The digestive system is the organ responsible for digesting food and converting it from solid to simpler and less complex forms to become absorbable in the body. This process is performed by muscles, teeth and chemicals in the stomach. The digestive system is a long channel that starts from the mouth and ends with the anus. The digestive system in the human body can be divided into two parts: gastrointestinal tract and upper gastrointestinal tract. The whole digestive system in the adult human body is about six meters and half a meter.
The upper gastrointestinal tract consists of: the mouth, which contains the so-called mucous membranes that include salivary glands that produce saliva at a rate of one liter and half a liter per day. During chewing, saliva mixes with food. Saliva moisturizes the food to be Is easy to swallow, and analyzes carbohydrates in the food to a simple sugar by the enzymes contained, and the tongue, which moves the food and transport on both sides of the mouth to facilitate chewing, and is responsible for the taste to differentiate between good foods from the poor, and foods that are not suitable for stomach and Could be rejected by M, and teeth that cut food into small portions and pureed in the form becomes easier to swallow and digest when it moves to the next stage of the process in the gut. The upper gastrointestinal tract also includes the pharynx. The pharynx leads to the esophagus, which involves the process of contractions to push food down through the muscles, and extends the esophagus across the chest, breaking the diaphragm in the form of a tube, to reach the stomach, and is in the form of a strong muscle bag that can expand to store foods that are swallowed , And the stomach undergoes a process of analysis of the food through the crushing muscle and mixed with intestinal juices that are secreted through the wall of the stomach, so that the food into a dense mass of the people, is then passed on a muscle called the pectoral sphincter that delivers to the small intestine.
The lower gastrointestinal tract includes both the small intestine, which completes the chemical analysis of the food and continues to absorb the body for food. The small intestine is only seven meters long. The large intestines, and the anus.