Chapter 30 Renal Regulation of Electrolytes

Question 1

Which of the following is not responsible for potassium uptake into the cell?

A. Insulin
B. Aldosterone
C. Catecholamines
D. Strenuous exercise
E. Alkalosis

Answer 1

D. Strenuous exercise is responsible for an increase in extracellular potassium, as there is a release of potassium from the skeletal muscle.

Insulin, aldosterone and catecholamines, especially epinephrine, cause an uptake of potassium from the cells. An alkalosis decreases extracellular fluid potassium concentrations.

Question 2

Where is most of the potassium reabsorbed in the kidney?

A. Thick ascending loop of Henle
B. Distal tubule
C. Proximal tubule
D. Collecting tubules

Answer 2

C. Proximal tubules, approx 65% of filtered K