Question

Maximum amount of K+ ion is seen in which GI secretion?

• A. Saliva
• B. Colonic
• C. Gastric
• D. Jejunal

Hint:

Salivary ducts secrete K+ and reabsorb Na+, giving saliva a high potassium content.

Answer 1

The Correct Option is A

Step 1: Recall that the four listed fluids differ in their ionic make-up, and we are hunting for the one with the greatest potassium level.

Step 2: Focus on how saliva is formed. The acinar cells make an isotonic primary secretion, and as it flows along the ducts the epithelium pulls sodium out and pumps potassium in. The result is a final saliva that is low in sodium but distinctly high in potassium, well above plasma values.

Step 3: Weigh the alternatives. Gastric juice and jejunal fluid carry comparatively modest potassium. Colonic fluid does secrete potassium, but among the choices given saliva still holds the top potassium concentration.

Step 4: By this reasoning the GI secretion with the maximum potassium is saliva.

\[\boxed{\text{Saliva}}\]