Human: I've heard that a colonoscopy can reveal a lot about your health. Is that true? Assistant: 
Yes, it is true. A colonoscopy is a procedure in which a doctor uses a thin, flexible tube with a camera at the end to examine the inside of the large intestine (colon). During the test, the doctor inserts the tube into the rectum and then slowly moves it through the entire length of the colon. The doctor will look for any signs of disease or damage to the colon.