Which structure filters blood, forming urine with water and wastes removed from the blood?

Which structure filters blood, forming urine with water and wastes removed from the blood?

• A. Ureter
• B. Urethra
• C. Ampullary gland
• D. Nephron

Answer: (D)

The nephron is the structure that filters blood to form urine. In the nephron, blood is filtered in the glomerulus as it sits inside Bowman's capsule, producing a filtrate that contains water and wastes. As this filtrate passes through the tubules, essential substances and much of the water are reabsorbed back into the blood, while waste products are secreted into the filtrate. This process ultimately forms urine that contains water and wastes removed from the blood. The ureter and urethra transport urine after it is formed, not filter the blood. The ampullary gland isn’t part of the kidney’s filtration system.

The nephron is the structure that filters blood to form urine. In the nephron, blood is filtered in the glomerulus as it sits inside Bowman's capsule, producing a filtrate that contains water and wastes. As this filtrate passes through the tubules, essential substances and much of the water are reabsorbed back into the blood, while waste products are secreted into the filtrate. This process ultimately forms urine that contains water and wastes removed from the blood. The ureter and urethra transport urine after it is formed, not filter the blood. The ampullary gland isn’t part of the kidney’s filtration system.