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.

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Learn to recognize the symptoms of a concussion and what causes them. Worried that your child has a concussion? Learn the symptoms of a concussion and how to treat it.

By Dr. Rob Danoff

Human bodies are wonderlands of grossness. You might be shocked to know some of the nastiest things your body is harboring right this minute.

By Maria Trimarchi

Avoid bloating this bathing suit season by taking these bloating tips to heart and looking great in your slimmest bathing suit!

By Discovery Fit and Health Writers

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If you've ever considered burning them off for various nefarious purposes, you may want to reconsider. Those babies are more than just loopy tools of identification.

By Robert Lamb

During early pregnancy, both male and female human embryos develop something called milk lines, ridges that eventually recede into nipples. Why have some species lost this unisex trait, and can human men actually produce milk?

By Cristen Conger

Every day in the United States, an average of 18 people die while awaiting organ transplants because of a critical shortage of donors. Get facts about organ donation here.

By Discovery Fit and Health Writers

How smart are you? Take this quick brain test to peek inside the power of your brain.

By Discovery Fit and Health Writers

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Every guy is self-conscious about something, and hours are often spent wondering how he measures up to the competition. But what would-be body flaws are the most embarrassing?

By Kevin P. Allen

Beauty may be in the eye of the beholder, but women are definitely held to higher standards than men. Could this be why so many of us are embarrassed of our bodies?

By Terri Briseno

Sometimes people choose not to eat for religious, political or health reasons. It's called fasting, and it's been popular for thousands of years. What effects does fasting have on the body? Is it safe?

By Alla Umanskiy

No one is perfect, but sometimes, we go above and beyond to hide our flaws. Is your No. 1 insecurity on our list?

By Sara Elliott

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Your pituitary gland manages most hormone production. Learn about the pituitary gland in this article.

By HowStuffWorks.com Contributors

The function of the respiratory system is to bring oxygen to all the parts of your body. Learn what the function of the respiratory system is in this article.

By HowStuffWorks.com Contributors

The respiratory system organs include the airways, the lungs, and the blood vessels and muscles attached to them. Learn what the respiratory system organs are in this article.

By HowStuffWorks.com Contributors

Here are some facts about the respiratory system, the group of tissues and organs in your body that enable you to breathe. Learn some facts about the respiratory system in this article.

By HowStuffWorks.com Contributors

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The sphenoid sinuses are located behind your eyes. Learn more about what sinus is located behind your eyes from this article.

By HowStuffWorks.com Contributors

The maxillary sinuses are located right under your eyes and above the roots of your upper teeth. Learn more about the location of your maxillary sinuses from this article.

By HowStuffWorks.com Contributors

The respiratory system has several ways to defend itself, including cilia fibers. Learn more about how the respiratory system defends itself from this article.

By HowStuffWorks.com Contributors

Teens brains really function differently than adult brains. Learn about the development of teens’ brains in this article.

By HowStuffWorks.com Contributors

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An Adam's apple is the protrusion of cartilage in the neck. Learn about an Adam's apple from this article.

By HowStuffWorks.com Contributors

Whenever you delve into the realm of the paranormal, you're bound to feel the heat of argument between skeptics and believers. Why not end the argument once and for all and locate the part of the brain that may (or may not) control ESP?

By Heather Quinlan

Think it's a hassle when your car breaks down? Try finding a spare organ when your body gives out. Thanks to years of research, scientists are now amassing a "body shop" of sorts, dealing not in tires or mufflers, but in bladders, bones and breasts.

By Molly Edmonds

The adrenal gland is critical for life and optimal health. Learn how proper nutrition, adequate rest, exercise and stress reduction, will ensure that your adrenal gland and overall health will prosper.

By the editors of PureHealthMD

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Dehydroepiandrosterone, or DHEA, has a growing reputation as an anti-aging supplement among vitamin users and doctors. Learn about the risks, benefits and controversy of DHEA.

By the editors of PureHealthMD

Testosterone is one of the most important, but commonly misrepresented hormones found in the body. Learn about the role of testosterone.

By the editors of PureHealthMD