It's weird how the human body is constantly losing and growing things. Which of these body parts regenerates every 3 to 4 days?

Your body's stomach lining is continually exposed to strong digestive acids, and if they weren't continually replaced they would completely dissolve. People who have ulcers experience first hand the way stomach lining can hurt when it dissolves faster than it can be replaced.

Asked by Tom Cohen · Last updated 5 years ago · 11.8K views