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.
Bison's only significant predators are wolves and grizzlies that usually have to content themselves with preying on stray calves or old, weakened adults.The bison's primary defense is to stampede, running away from predators at speeds up to 32 miles per hour, faster than a wolf.