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
Outer membrane action potential is maintained by influx of 
Select and explain. 
A. Na+, B. Mg3+, C. K+, D. CA2+
C: K+
Answer: C: K+ 
Explanation: Outer membrane action potential is maintained by influx of K+ Ref: guyton and hall textbook of medical physiology 12 edition page number:66,67,68