The colon and how its bacteria helps digest food. The colon is a part of the digestive system it is also called the large intestine. The large intestine or colon is shorter than the small intestine but has a larger diameter. The length of the colon is approximately 5 feet long.
In summary, 1  Both endoscopy and colonoscopy are the procedures to visualise the gastro intestinal path (Food canal). 2  The differences are endoscopy will be inserted from the mouth; colonoscopy will be inserted from the anus. 3  Unlike in colonoscopy, bowel preparation is not needed to do the endoscopy.
There are two basic types of endoscopy: 1  Upper endoscopy â The esophagus, stomach, and small intestines can be viewed by a thin flexible tube inserted through the mouth. 2  Colonoscopy â The lining of the large intestine, colon and rectum can be viewed by a flexible tube inserted through the rectum.