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== Arthritis Words to Know ==
 
== 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.
 
* Cartilage: Tough, elastic tissue that covers and protects the ends of bones.
* 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.
 
* 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 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.
 
* Synovial membrane: A thin tissue that covers the inside surface of a joint.