Zoology - Human Health and Diseases Question with Solution | TestHub

Rheumatoid arthritis is a chronic (long-lasting) inflammatory disease that causes pain, stiffness, warmth, redness and swelling in joints.

When the body's immune system does not operate as it should, white blood cells that normally attack bacteria or viruses attack healthy tissue instead - in this case, the synovium, or joint tissue. As the synovial membrane (the thin layer of cells lining the joint) becomes inflamed, enzymes are released. Over time, these enzymes and certain immune cells damage the cartilage, bone, tendons and ligaments near the joint.