This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
When extracellular potassium is increased from 4 meq to 10 meq what will happen 
Select and explain. 
A. Resting membrane potential becomes more negative, B. Increase in conductance of sodium, C. Increase in conduction of potassium, D. Na+ K+ ATpase will be stopped
C: Increase in conduction of potassium
Answer: C: Increase in conduction of potassium 
Explanation: If the extracellular potassium concentration surrounding a myocyte increases, then the potassiumgradient accross the cell membrane decreases, and therefore the resting membrane potential will become more positive. There fore increase in the conduction of pottasium increases Similarly, if extracellular potassiumdecreases, the resting membrane potential will be more negative. Ref guyton and hall textbook of medical physiology 12/e p59