The digestive system is made up of organs like the mouth, esophagus, stomach, intestines and colon. With help from accessory organs like the liver, pancreas and gallbladder, it digests food, absorbs nutrients and eliminates waste. The document then discusses specific digestive processes like colonoscopy, hematochezia, cachexia and lavage. Colonoscopy allows examination of the colon and removal of polyps. Hematochezia is the presence of blood in stool which can indicate cancers or other issues. Cachexia causes wasting from chronic diseases through loss of muscle and fat. Lavage uses a tube to wash out the stomach, used in overdoses to reduce toxicity.