Which organ filters our blood to remove waste and produce urine?

• A. Liver
• B. Pancreas
• C. Bladder
• D. Kidneys

Answer: (D)

The kidneys perform the blood filtration and urine formation process. Blood flows into the kidneys and reaches tiny filtering units called nephrons, beginning with a structure called the glomerulus where many small particles, including wastes and water, pass into the tubules while larger components stay in the blood. As the filtrate moves through the tubules, the body reabsorbs needed substances such as certain ions and water back into the bloodstream, while additional wastes may be added into the filtrate. The remaining fluid becomes urine, which is collected and then funneled to the bladder for storage.

Other organs have different roles: the liver detoxifies and processes chemicals, the pancreas produces digestive enzymes and hormones, and the bladder simply stores urine rather than filtering blood.