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Directory:Tell Me About Senior Health/Arthritis/Arthritis (view source)

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== Arthritis Words to Know ==

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* Autoimmune disorder: A condition in which the body's immune system attacks some part of the body and treats it as if it were a foreign invader.

* Cartilage: Tough, elastic tissue that covers and protects the ends of bones.

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* Immune system: A network of organs, tissues, cells, and chemicals that protects the body from foreign invaders, such as bacteria and viruses.

* Joint: A structure holding two or more bones together.

* Synovial fluid: A fluid produced by the synovial membranes in a joint that lubricates the movement of the bones in the joint.

* Synovial membrane: A thin tissue that covers the inside surface of a joint.

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