This document discusses immunological disorders and provides information about rheumatoid arthritis. It outlines the components of the immune system including primary organs like the bone marrow and thymus and secondary organs such as lymph nodes and spleen. It then describes disorders related to high immunity including ulcerative colitis and rheumatoid colitis as well as disorders related to low immunity such as AIDS. The document focuses on rheumatoid arthritis, discussing its causes, pathophysiology, clinical manifestations, diagnostic findings, nursing assessments, diagnoses, care planning, goals, and interventions.