This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Resting membrane potential of skeletal muscle is equal to equilibrium potential of ______ 
Select and explain. 
A. Na+, B. Cl-, C. K+, D. Ca2+
C: K+
Answer: C: K+ 
Explanation: Resting membrane potential of skeletal muscle, cardiac muscle is equal to equilibrium potential of K. Both measures 90mV