What is tubular reabsorption?

What is tubular reabsorption?

• A. Moves substances from the tubular fluid to the blood.
• B. Moves substances from the blood to the tubular fluid.
• C. Occurs in the glomerulus to form filtrate.
• D. Produces urine in the renal pelvis.

Answer: (A)

Tubular reabsorption is the movement of substances from the tubular fluid back into the blood. After the filtrate is formed in the glomerulus, the tubules reclaim useful items—water, glucose, amino acids, bicarbonate, and many ions—by transporting them from the tubular lumen into the peritubular capillaries. This recovery is essential for conserving nutrients and maintaining fluid and electrolyte balance. Water often follows solutes by osmosis, helping to concentrate or dilute the filtrate as needed. Hormones like aldosterone and antidiuretic hormone regulate reabsorption at specific segments of the nephron, fine-tuning how much solute and water are reabsorbed. In contrast, tubular secretion moves substances from the blood into the tubular fluid for elimination. Filtration at the glomerulus creates the filtrate, and urine is formed as the tubular fluid is processed along the nephron and drained toward the renal pelvis.

Tubular reabsorption is the movement of substances from the tubular fluid back into the blood. After the filtrate is formed in the glomerulus, the tubules reclaim useful items—water, glucose, amino acids, bicarbonate, and many ions—by transporting them from the tubular lumen into the peritubular capillaries. This recovery is essential for conserving nutrients and maintaining fluid and electrolyte balance. Water often follows solutes by osmosis, helping to concentrate or dilute the filtrate as needed. Hormones like aldosterone and antidiuretic hormone regulate reabsorption at specific segments of the nephron, fine-tuning how much solute and water are reabsorbed. In contrast, tubular secretion moves substances from the blood into the tubular fluid for elimination. Filtration at the glomerulus creates the filtrate, and urine is formed as the tubular fluid is processed along the nephron and drained toward the renal pelvis.