Body Facts About Anatomy

Your cornea has no blood supply at all — it gets its oxygen directly from the air, dissolved through your tears. It's one of the only tissues in the human body that is completely avascular. This is also why wearing contact lenses for too long can cause problems: they block oxygen from reaching the cornea.

All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.

It is impossible to hum if your nose is plugged.

Your heart will pump about 212 million liters in its lifetime.

The adult human brain weighs about 3 pounds (1,300-1,400 g).

Like fingerprints, everyone's tongue print is different.

Your stomach produces a new layer of mucus every few days to protect itself from being digested by its own acid.

Most people cannot lick their own elbow due to the length of the human arm and the limited range of motion in the shoulder and elbow joints.

The lense of the eye continues to grow throughout a person's life.

Fingernails grow nearly 4 times faster than toenails!

Your skin is actually an organ.

The human heart creates enough pressure to squirt blood 30 ft.

Human teeth are almost as hard as rocks!

Your ribs move about 8 million times a year, every time you breathe!

25% of your bones are located in your feet.

You mostly breathe from only one nostril at a time!

One quarter of the bones in your body are in your feet!

Like fingerprints, everyone's tongue print is different!

You're born with 300 bones, but when you get to be an adult, you only have 206!

Human thigh bones are stronger than concrete!