Ever wonder how your body knows the difference between poop and a fart? It’s not luck. It’s anatomy and nerve reflexes working together. The rectum acts as a storage pouch for stool and contains stretch sensors. When stool moves into the rectum, a small sample enters the anal canal. Nerve sensors then send information to your brain to identify whether it’s gas, liquid, or solid. The internal anal sphincter works automatically through your nervous system. The external anal sphincter is the muscle