Inflammation of the lining of the lungs and chest that causes chest pain when breathing?

• A. Pleurisy
• B. Bradycardia
• C. Vein
• D. SA node

Answer: (A)

The main idea being tested is recognizing pleurisy, which is inflammation of the pleura—the lining around the lungs and inside the chest cavity. When the pleura are inflamed, the tiny nerve fibers in these linings become irritated, and each breath rubs the two inflamed surfaces together. That friction produces sharp, localized chest pain that intensifies with deep breaths, coughing, or sneezing. This pleuritic pain pattern helps distinguish it from other chest discomforts that aren’t tied to breathing.

The other options don’t fit this presentation. Bradycardia refers to a slow heart rate, which isn’t defined by chest wall inflammation or pain triggered by respiration. A vein is a blood vessel and isn’t a condition or process that would cause pleuritic chest pain. The SA node is the heart’s natural pacemaker; issues there affect heart rhythm, not inflammation of the lung lining or pain that worsens with breathing.