Body Parts
Body Parts work together to perform different functions required for life. Learn how your internal organs operate in this section. See more »
what's inside: anatomy channel
Anatomy covers the structure and functions of the body's organs and systems. Learn how these components work in harmony to sustain human life.
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Body Systems
Your body is pretty amazing. At any given point you have many biological processes going on -- circulatory, digestive, brain & central nervous systems and more. Learn about these body systems as well as the eye, ears, nose and throat. See more »
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Cells & Tissues
Cells & Tissues are the building blocks for human organs. Learn about the structure and function of cells and tissues. See more »
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featured articles
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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videos: anatomy
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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 Appendix Works
Does the appendix serve any purpose in the human body? Scientists are divided on the issue -- learn why.
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