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.
WHAT'S INSIDE: HUMAN BODY
- Body Parts
- Body Systems
FEATURED: HUMAN BODY
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The lymph system is the body's drainage system. It is composed of a network of vessels and small structures called lymph nodes. Learn more about the workings of this crucial system.