Question

when the plasma concentration of a substance exceeds its renal concentration, more of the substance will be
filtered.

excreted.

reabsorbed.

secreted.

none of the above

Explanation:

Renal excretion depends on filtration, reabsorption, and secretion. When plasma concentration of a substance exceeds its renal (tubular) concentration, the concentration gradient favors movement from plasma to tubule, increasing secretion (active/passive transport into tubule). Filtration is limited by glomerular filtration rate, reabsorption decreases excretion, and excretion is the end result (not the direct process here).

Answer:

D. secreted.