Human Body

The human body is an amazing structure made up of many fascinating parts and systems. Learn about the human body and how its systems work together.

Topics to Explore

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Brain Pictures

What does your brain really look like? It depends on how it's imaged. Take a look at all the different ways we can view the human brain.

How Your Appendix Works

Does the appendix serve any purpose in the human body? Scientists are divided on the issue -- learn why.

How do broken bones heal?

Unfortunately for him, Humpty Dumpty was not blessed with the human skeletal system. Why can your skeleton do what all the king's horses and all the king's men can't?

How Osteogenesis Imperfecta Works

How could a high-five or a handshake lead to a wrist fracture? People with osteogenesis imperfecta must carefully consider these seemingly innocent actions to prevent broken bones.

Why does my stomach growl?

Whether you call it grumbling, gurgling or growling, sometimes your belly just won't keep quiet. What makes your stomach growl, and why does it seem to happen at the worst times?

Serum Creatinine Overview

Creatinine is a chemical molecule that is present in the serum (liquid portion) of the blood. The amount of creatinine produced depends on a person's muscle mass. But how is it measured?

What if I crossed my eyes for 10 minutes?

"Don't cross your eyes -- they'll stick that way!" That's something most of us have heard from our mothers at one time or another. Can your eyes really get stuck?

What if people had gills?

In the movie "WaterWorld," Kevin Costner's character has a mutation that gives him gills behind the ears. Could a mutation allow people to swim in the water just like fish --without having to use any sort of scuba equipment?

What if I ate the silica packets marked "do not eat"?

Silica packets most likely contain silica gel or some other desiccant -- something that absorbs (collects) and holds water vapor. What would happen if you put that gel in your mouth?

Natriuretic Peptide

The natriuretic peptides are sometimes called the body's "natural diuretics" because they lower the concentration of sodium in the blood.

Why do loud noises cause your ears to ring?

Back away from that speaker, turn down your music, and put down that power tool unless you want the ringing in your ears to be permanent. Sound can hurt you, and that ringing may be the first sign.

How the Digestive System Works

What happens to your lunch after you eat it? As you read this, your digestive system is hard at work, taking it on a wild ride through your body.

If I couldn't get rid of gas in any way, would I explode?

People expel gas by either burping or flatulating. Although it's an embarrassing thing to have happen, it's also a necessity. But what would happen if you just couldn't pass the gas?

Why do we have eyebrows?

Eyebrows add expression to your face, and are often waxed and plucked in the name of beauty. But why do we have them in the first place, and what would happen if they went away?

How Colorblindness Works

Roses are red, violets are blue -- well, bluish. The sky is blue, too. Grass is green. These are things that most of us know for a fact and don't question. But what if you were colorblind? What would you see? Is life one long black-and-white movie?

How Your Tongue Works

Despite what people say, the tongue isn't your body's strongest muscle. But you do depend on it for eating, tasting and speaking.

Why do you have two lungs but only one heart?

Why don't you have two hearts? Here's a hint: It's the same reason why you have one liver, but two eyes. Would a second heart help you live better?

Where's the best place to take a bullet if you get shot?

Getting shot is not something we want to happen, but if it does, where is the best place to take a bullet? Find out what the experts think.

How Nerves Work

You touch a hot object and immediately drop it. It happens so quickly you don't even think about it. How does this happen? Your nervous system coordinated everything.

16 Unusual Facts About the Human Body

Our list of 16 unusual facts about the human body will both shock and enlighten. Did you know that everyone has a unique tongue print or that we shed skin cells the same way a dog sheds hair?

13 People with Extra Body Parts

Extra body parts can occur more often than people might think. Doctors call the extra appendages "supernumerary" body parts and these can be found on some famous people in history.

How to Test Your Memory

Finding out what shape your memory is in should be the first step in trying to improve it. Test your memory to find out if those memory glitches are normal.

How to Improve Your Memory

You can improve your memory by taking several simple steps. You can make the decision to get better at remembering things today! Learn more about sharpening your memory in this article.

Improving Memory: Lifestyle Changes

Worried about memory loss? Fear not, there are still lots of lifestyle changes you can make to help prevent it, such as managing stress. Learn more about memory-saving lifestyle changes in this article.

Can humans regrow fingers?

Can humans regrow fingers? Fetuses can regrow almost anything that gets damaged while in the womb. But can adult humans can regrow fingers?


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