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.
Before their adoption of guns, the Plains Indians hunted with spears, bows, and various forms of clubs. The use of horses by the Plains Indians made hunting (and warfare) much easier. With horses, the Plains Indians had the means and speed to stampede or overtake the bison.