Here are the pictures of the inside of my colon that I mentioned in my comment to the post just above this post. Older people like me should have a colonoscopy every 10 years. Click an image for a larger view.
End of colon looking into small intestines.
Point where appendix connects to the colon. The camera is inside the colon and doesn't see the appendix.
Other end of the colon, looking into the anus. The gray area in the center is a hemorrhoid. The black area above the hemorrhoid is the balloon that was pushed through the colon.