Which of the following electrolytes does insulin help to move into the cells?

AIIMS Patna NO - 2020

Applied Physiology

Easy

Appeared in: AIIMS Patna NO - 2020

Explanation

Insulin facilitates the movement of potassium from the blood into the cells.
This process is mediated by insulin's stimulation of the sodium-potassium ATPase (Na+/K+-ATPase) pump on cell membranes.
The activation of this pump increases the uptake of potassium by cells, thereby lowering the serum potassium concentration.
This mechanism is a key physiological process and is also utilized therapeutically to manage high potassium levels.

Option A: Bicarbonate levels are primarily regulated by the kidneys and the respiratory system to maintain acid-base balance, not by insulin's direct transport action.
Option B: Chloride is the major extracellular anion, and its balance is closely linked to sodium and regulated by the kidneys. Insulin does not have a primary role in moving chloride into cells.
Option C: Carbonate is not a primary electrolyte regulated in this context. Bicarbonate is the physiologically significant buffer ion. Insulin does not directly transport carbonates.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Effect of insulin on electrolyte transport as background academic context rather than a clinical decision trigger.
A primary clinical application of this principle is the emergency treatment of hyperkalemia (high serum potassium), where an infusion of insulin and glucose is given to rapidly shift potassium from the blood into the cells, preventing life-threatening cardiac arrhythmias.
Nurses must be vigilant in monitoring potassium levels when administering insulin, especially in patients with diabetic ketoacidosis (DKA). As insulin corrects the hyperglycemia, it also drives potassium into cells, which can lead to severe hypokalemia if not monitored and corrected.
What if? If a patient with normal potassium levels is given a large dose of insulin without supplemental glucose (e.g., accidental overdose), they are at high risk for not only severe hypoglycemia but also significant hypokalemia, which can cause muscle weakness, paralysis, and cardiac arrest.

How to Approach the Question

First, identify the core of the question, which is about the relationship between insulin and electrolytes.
Recall the primary physiological functions of insulin. While its main role is glucose metabolism, remember that it has other important effects.
Consider each electrolyte option. Think about how each one is regulated in the body.
Access your knowledge about insulin's specific effect on the Na+/K+-ATPase pump, which is a key mechanism for cellular transport.
This knowledge directly links insulin to the intracellular movement of potassium, making it the correct answer.

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