This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
Most of the ATP generated in nerve cells is utilized to energize the: 
Select and explain. 
A. Na-Ca exchanger, B. H-ATPase in the cell membrane, C. Na-K ATPase, D. synthesis of proteins
C: Na-K ATPase
Answer: C: Na-K ATPase 
Explanation: Ans. C. Na-K ATPaseA large fraction of ATP (nearly 70%) synthesized in neurons is used to energize the Na-K ATPase and maintain ion gradients across the nerve cell membrane.