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 are ungulates, meaning they have hooves. They have a hump and huge heads and shoulders, and both males and females have short, curved horns. There are two types of American Bison - the Wood Bison (Bison athabascae) and the Plains Bison (Bison bison bison). The Wood Bison is larger and heavier, with a darker coat. Long strands of hair hang between its horns and it has a thinner beard and throat mane. The Plains Bison is smaller.