Which organ is primarily responsible for filtering blood and producing urine?

Which organ is primarily responsible for filtering blood and producing urine?

• A. The liver.
• B. The kidneys.
• C. The heart.
• D. The spleen.

Answer: (B)

The kidneys filter waste from the bloodstream and form urine. They contain nephrons that perform filtration in the glomerulus, reabsorb needed substances in the tubules, and secrete wastes, producing urine that is collected and excreted. This filtering keeps fluid, electrolyte, and acid-base balance in check and helps regulate blood pressure. While the liver detoxifies chemicals, the heart pumps blood, and the spleen handles immune and blood-filtering tasks, none of these primarily create urine.

The kidneys filter waste from the bloodstream and form urine. They contain nephrons that perform filtration in the glomerulus, reabsorb needed substances in the tubules, and secrete wastes, producing urine that is collected and excreted. This filtering keeps fluid, electrolyte, and acid-base balance in check and helps regulate blood pressure. While the liver detoxifies chemicals, the heart pumps blood, and the spleen handles immune and blood-filtering tasks, none of these primarily create urine.