Question

Excretion of potassium is governed primarily by

• A. Potassium re-absorption in proximal convoluted tubule
• B. Potassium secretion in proximal convoluted tubule
• C. Potassium secretion in distal convoluted tubule
• D. Potassium re-absorption in distal convoluted tubule

Answer 1

The correct option is C Potassium secretion in distal convoluted tubule

The proximal convoluted tubule performs about 66% re-absorption of the filtered potassium ions. However, whenever the dietary consumption of the potassium increases, the aldosterone hormone acts of the distal convoluted tubule from where the secretion of the excess potassium ions will take place into the filtrate. Also, when the concentration of potassium is less and blood pressure is decreasing, then potassium ions will be re-absorbed in the distal convoluted tubule.

Hence, the correct answer is 'Potassium secretion in distal convoluted tubule'.