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.
The American bison is a large hoofed mammal (or ungulate) that inhabits the plains of the United States and Canada. Though sometimes called a buffalo, the American bison is not related to the water buffalo or the African buffalo, which are the only true buffaloes in the world. The American bison is more closely related to cows and goats. Male bison are slightly larger than females.