Which structure is a nephron component among the following options?

Which structure is a nephron component among the following options?

• A. proximal convoluted tubule
• B. renal pelvis
• C. ureter
• D. calyx

Answer: (A)

The nephron is the kidney’s functional unit, built from the glomerulus with Bowman's capsule plus a tubular component that handles filtration, reabsorption, and secretion. The proximal convoluted tubule is the first segment of that tubular portion after Bowman's capsule and is a key nephron component. It sits in the renal cortex and has a tall, brush-border (microvilli) lining to maximize reabsorption of water, ions, and nutrients from the filtrate, with many mitochondria to fuel active transport. In contrast, the renal pelvis, calyx, and ureter are part of the kidney’s drainage or collecting system; they transport urine away from the kidney to the bladder, not parts of the nephron where filtration and initial reabsorption occur. That distinction is why the proximal convoluted tubule is the correct choice.

The nephron is the kidney’s functional unit, built from the glomerulus with Bowman's capsule plus a tubular component that handles filtration, reabsorption, and secretion. The proximal convoluted tubule is the first segment of that tubular portion after Bowman's capsule and is a key nephron component. It sits in the renal cortex and has a tall, brush-border (microvilli) lining to maximize reabsorption of water, ions, and nutrients from the filtrate, with many mitochondria to fuel active transport.

In contrast, the renal pelvis, calyx, and ureter are part of the kidney’s drainage or collecting system; they transport urine away from the kidney to the bladder, not parts of the nephron where filtration and initial reabsorption occur. That distinction is why the proximal convoluted tubule is the correct choice.