Rheumatoid arthritis (RA) is an autoimmune disease that causes chronic inflammation of the joints. Autoimmune diseases are illnesses that occur when the body's tissues are mistakenly attacked by their own immune system.
What role did the bison or buffalo play in the culture of the Plains Indians? The bison were an important source of fur, food, and shelter for the Plains Indians. They used every part of the animals they killed. Bison were also an important part of their culture.
Technically, the animal is a bison, but it is commonly called a buffalo, particularly by Indian people. At the present time, there are two subspecies of bison in North America: plains bison (Bison bison bison) and wood bison (Bison bison athabascae). Over the past 10,000 years, the North American bison have been gradually decreasing in size.