Body parts Facts
- Wisdom teeth serve no purpose. They’re left over from hundreds of thousands of years ago. As early humans’ brains grew bigger, it reduced space in the mouth, crowding out this third set of molars.
- Your fingernails don’t actually grow after you’re dead.
- Our nose can detect about 1 trillion smells.
- Thumbs have their own pulse.
- The foot is one of the most ticklish parts of the body.
- Your tongue is made up of eight interwoven muscles, similar in structure to an elephant’s trunk or an octopus’s tentacle.
- The heart beats more than 3 billion times in the average human lifespan.
- You have two kidneys, but only one is necessary to live.
- Belly buttons grow special hairs to catch lint.
- The satisfying sound of cracking your knuckles comes from gas bubbles bursting in your joints.
- Skin is the body’s largest organ and can comprise 15 percent of a person’s total weight.
Other Human Facts
- Scientists aren’t exactly sure why we yawn, but it may help regulate body temperature.
- You will not believe but If the blood vessels were laid end to end, all of the blood vessels in the human body would encircle the Earth four times.
- As you breathe, most of the air is going in and out of one nostril. Every few hours, the workload shifts to the other nostril.
- Blood makes up about 8 percent of your total body weight.
- On a genetic level, all human beings are more than 99 percent identical.
- The pineal gland, which secretes the hormone melatonin, got its name from its shape, which resembles a pine nut.
- No one really knows what fingerprints are for, but they might help wick water away from our hands, prevent blisters, or improve touch.
- Blushing is caused by a rush of adrenaline.
- Humans are the only animals with chins.
