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 American Bison. Despite the bison's importance to Americans as a symbol of strength, individuality and freedom in the 19th century, this continent's heaviest land mammal, also known as the buffalo, was slaughtered to the brink of extinction.