Which organ filters blood and creates urine?

• A. Liver
• B. Kidney
• C. Spleen
• D. Lungs

Answer: (B)

The kidneys handle filtering blood and forming urine. Inside each kidney, nephrons filter plasma at the glomerulus, then tubules reabsorb needed substances and secrete wastes, producing urine that’s collected and eliminated. This combination—blood filtration and urine creation—defines the kidney’s role. The liver processes nutrients and toxins, the spleen helps with immune functions and old red cell removal, and the lungs exchange gases and remove carbon dioxide. So the kidney is the organ responsible for both filtering blood and making urine.