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.
Herds of bison wandered the Plains, and their meat, next to corn, formed the main food for the Pawnee. One bison provided enough meat to feed one person for a year. Almost every part of the bison was used by the Pawnee. The horns were made into spoons; the thick hide on top of the head was used as a bowl.