The humerus is the long bone that extends from the shoulder to the elbow. Which skeletal system does the humerus belong to?
Rheumatoid arthritis is a disease that occurs when the body’s immune system starts attacking its own joint tissue. The symptoms are pain, inflammation, and swelling in the joints. Orthopedists (doctors who study bones) and immunologists (doctors who study the immune system) both work with patients who have rheumatoid arthritis. What is the difference between the orthopedists and immunologists who treat the disease?
Consider the skeleton. Which skeletal system is represented by the shaded portion of the skeleton?

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