The very last part of the colon, before reaching the rectum, is in an "S" shape and called the sigmoid colon. By the time stool gets to this part of the colon, most nutrients have been absorbed back …

The very last part of the colon, before reaching the rectum, is in an "S" shape and called the sigmoid colon. By the time stool gets to this part of the colon, most nutrients have been absorbed back …
