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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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What is an appendix and what causes appendicitis?

Your appendix is really a pretty mysterious organ. Find out why you have an organ that's not necessary to your survival.

Why do my ears pop when I dive in the deep end of the pool?

Your ears are very sensitive to the air or water pressure around them. But just what happens when you dive into that pool?

How Your Heart Works

The heart is a vital organ that basically serves as a pump. Learn about heart chambers and valves, blood flow, the heart's electrical system and blood supply. Read more about how this amazing organ works.

How Your Immune System Works

There are millions of bacteria, microbes, viruses, toxins and parasites that want to invade your body. And they'd happily do it, too -- if it weren't for your immune system.

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