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.
A: Plains Indians lived in tepees -- also known as teepees, tepes and tipis -- because these dwellings were easy to move as the Native Americans followed herds of migrating buffalo, or bison. Because they depended upon the animals for food and goods, the Plains Indians led nomadic lives in order to maintain a constant supply of bison.