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.
Millions of bison once thundered across North America. These massive animals, characterized by their long, shaggy brown coats, have poor eyesight but acute hearing and an excellent sense of smell. Historically, the American bison played an essential role in shaping the ecology of the Great Plains.