Question

What is the normal source of the new bicarbonate in the late distal tubule and collecting ducts?

1) carbon monoxide produced in the distal tubule
2) catabolism of lysine
3) catabolism of glutamine
4) carbon dioxide from the systemic circulation
5) carbon dioxide produced by the tubule cells

Answer 1

The normal source of new bicarbonate in the late distal tubule and collecting ducts is carbon dioxide from the systemic circulation. This is catalyzed by carbonic anhydrase and results in the formation of bicarbonate ions and hydrogen ions.

Step-by-step explanation:

The normal source of new bicarbonate in the late distal tubule and collecting ducts is carbon dioxide from the systemic circulation. when carbon dioxide is available, it reacts with water to form carbonic acid. This reaction is catalyzed by carbonic anhydrase and results in the formation of bicarbonate ions and hydrogen ions. The bicarbonate ions are then transported to the peritubular capillaries.