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 Sioux Indians were a family-oriented, nomadic people who spoke the Dakota language and believed in Wakan Tanka, the one god. As nomads, the Sioux Indians roamed the Great Plains, following buffalo herds and using dogs to haul their belongings. Buffalo were the Sioux's main source of food and clothing.