Inflammation of the walls of a vein.

• A. Phlebitis
• B. Electrolyte
• C. Duodenum
• D. Pericardium

Answer: (A)

Inflammation of a vein is described by a term built from vein (phleb-) and inflammation (-itis). Phlebitis is the condition where the walls of a vein become irritated and inflamed. This can affect superficial veins or deep leg veins and may be called thrombophlebitis if a clot is involved. The other terms refer to different structures or concepts: an electrolyte is a mineral ion, the duodenum is part of the small intestine, and the pericardium surrounds the heart. So the term for inflammation of the walls of a vein is phlebitis.