Your Stomach Lining Is: 5 days old
Also known as the mucosa, your stomach lining plays a key role in helping you digest food. Special cells produce the acid and enzymes responsible for your stomach’s low pH, which promotes the chemical breakdown of, say, your lunch. In a work of genius, the same cells also secrete protective mucus that safeguards the stomach lining from the wear and tear of all that acid. All that and less than a week on the job!
Your Taste Buds Are: 10 days old
Small, but hard-working, your body’s 10,000-odd taste buds contain microscopic hairs called microvilli that convey facts about food to your brain—that Ben & Jerry’s scoop of Chunky Monkey is sweet, that hot pretzel is salty. Your taste buds are replaced often, but this process slows down (and some taste buds stop being replaced) with age. So older adults may only have 5,000 taste buds, according to kidshealth.org, which is why certain foods don’t taste as flavorful to seniors. Don’t miss these strange body parts and their surprising purposes.