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← Human Body & HealthWhich outcome results when blood potassium concentration decreases significantly?
A)Muscular and neural excitability increases
B)Action potential threshold strongly elevates✓
C)Resting membrane rapidly depolarizes
D)Sodium-potassium pump activity halts
💡 Explanation
Hypokalemia decreases extracellular potassium, causing hyperpolarization via increased potassium diffusion out of cells. Consequently, action potential threshold elevates because cellular excitability decreases; therefore, stronger stimuli is needed triggering activation, rather than depolarization risks arising.
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