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 Plains Indians lived in the area from the Mississippi River to the Rocky Mountains and from Canada to Mexico. The most important tribes were the Sioux, Blackfoot, Cheyenne, Crow, Kiowa, and Comanche. The plains area was hotter than 100 degrees in the summer, and could drop to 40 degrees below zero with heavy snows in the winter.