This is the functional unit in the kidney, it filters blood to form urine.

This is the functional unit in the kidney, it filters blood to form urine.

• A. Glomerulus
• B. Renal pelvis
• C. Nephron
• D. Ureter

Answer: (C)

The nephron is the kidney’s functional unit for turning blood into urine. Each nephron contains a glomerulus, where plasma filtration begins, and a renal tubule, where reabsorption and secretion adjust the filtrate into urine. The glomerulus filters blood to produce filtrate, but the tubule processes that filtrate to form the final urine. The renal pelvis and ureter are just drainage pathways, not filtration units. So the nephron best fits the description because it encompasses both filtration and the subsequent steps that create urine.

The nephron is the kidney’s functional unit for turning blood into urine. Each nephron contains a glomerulus, where plasma filtration begins, and a renal tubule, where reabsorption and secretion adjust the filtrate into urine. The glomerulus filters blood to produce filtrate, but the tubule processes that filtrate to form the final urine. The renal pelvis and ureter are just drainage pathways, not filtration units. So the nephron best fits the description because it encompasses both filtration and the subsequent steps that create urine.