|Functions And Parts Of The Digestive System
There are many different parts of the digestive system, and each part has a unique function to perform. On the whole, the different parts of the digestive system in unison.
Let us start with the mouth, which is the start of upper gastrointestinal tract. Digestion begins here with the chewing of food, and the mixing of saliva.
Next comes the esophagus, which starts from your throat and ends at the stomach. The esophagus works by pushing the food down to the stomach by peristalsis, which is muscular contractions. The esophagus ends in the lower esophageal sphincter which prevents food from the stomach from going up the esophagus again.
The stomach is a sac like organ which has digestive enzymes. Here the further breakdown of the food continues. The processed food is then sent to the small intestine.
The small intestine is 22 feet long and is made up of the duodenum, jejunum and ileum. The small intestine also uses peristalsis to push the food further down. It also aids in digestion with the help of enzymes by the pancreas, and bile from the liver. The absorption of nutrients takes place mainly in the jejunum and ileum. The remaining substances are sent into the large intestine.
The large intestine, or colon, is 6 feet long and muscular. The large intestine consists of the cecum, the ascending colon, the transverse colon, the descending colon, and the sigmoid colon, which ends at the rectum. The large intestine makes the wastes materials easy to eject.
The 8 inch long rectum receives the stools from the colon, and holds it till it is ready to be sent out of the body.
The rectum terminates at the anus which is the last part of the digestive tract. It is 2 inches long, and it can tell you whether the contents coming out of the rectum are solid, liquid or gas.
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