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
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 Refractive Vision Problems Work
Millions of people have refractive vision problems -- when the eyes get blurry or can't focus on an object. Learn about four major types of refractive vision problems.
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How Hearing Works
Ears are truly extraordinary organs and hearing is a fascinating process. Ears pick up all the sounds around you and then translate this information into a form your brain can understand.
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.
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