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 largest land mammal in the United States, which helped shape the Great Plains and the lifestyles of Native Americans, is the American bison. According to the American Bison Society, the American icon lives in all 50 states, and is as recognizable as the American eagle, but it's still called a buffalo when it's not.