The process during which potassium and hydrogen ions, penicillin, and some toxic substances are put into the urine by active transport is
A) tubular secretion.
B) reabsorption.
C) filtration.
D) countercurrent multiplication.
E) diffusion.

Question

Quizplus · Accepted Answer

Tubular secretion is the process of selectively transferring solutes and wastes from the blood into the filtrate that will become urine. Potassium and hydrogen ions, penicillin, and some toxic substances are actively transported from the blood into the urine during tubular secretion. Reabsorption is the process by which substances are selectively transported from the filtrate back into the blood, filtration is the initial process of urine formation where blood is filtered through the glomerulus, countercurrent multiplication is the process that occurs in the loop of Henle to establish a concentration gradient in the kidneys, and diffusion is the passive movement of substances from an area of high concentration to an area of low concentration.

The Process During Which Potassium and Hydrogen Ions, Penicillin, and Some