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.
From Mexico to Canada, bison populated the continent long before people settled there. Scientists believe that bison came to North America via a land bridge from Asia. As herbivores, the bison adapted to the Eastern woodlands and Great Plains, receiving nourishment from the rich grasses.