Arthritis primarily involves inflammation of which part of the body?

Arthritis is primarily characterized by inflammation that affects the joints. This condition can lead to pain, stiffness, swelling, and decreased range of motion in the affected areas. Joints are where two or more bones meet, and they play a crucial role in facilitating movement. Inflammation within the joint tissues—like the synovial membrane, cartilage, and other surrounding structures—is a hallmark feature that distinguishes arthritis from other conditions that may affect muscles or bones.

While inflammation can affect other structures in the musculoskeletal system, such as tendons and muscles, the defining characteristic of arthritis is its impact on the joints specifically. Understanding the anatomy of joints and the inflammatory processes involved in arthritis is essential for recognizing the signs and symptoms, as well as for diagnosis and treatment strategies. Thus, selecting joints as the correct answer accurately reflects the primary area affected by arthritis.