Question
What will decrease extracellular potassium?
| A. |
Glucagon
|
| B. |
Atropine
|
| C. |
Lactic acid
|
| D. |
Epinephrine
|
Show Answer
|
Correct Answer � D
Explanation
|
|
– Epinephrine: Acts as a beta-agonist, stimulating β2 receptors on cell membranes. This activation promotes Na+/K+ ATPase activity, driving K+ into cells, thus ↓ extracellular K+. Used in severe hyperkalemia for K+ reduction.
Incorrect Options:
– Glucagon: Hormone from pancreas; primarily ↑ blood glucose by glycogen breakdown, not K+.
– Atropine: Anticholinergic; blocks acetylcholine, ↑ heart rate & ↓ secretions, no effect on K+.
– Lactic Acid: From anaerobic metabolism; causes acidosis & typically ↑ extracellular K+.
