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
Na+ K+ pump which enzyme is used 
Select and explain. 
A. ATPase, B. GTpase, C. Acetyl CoA, D. NADPH
A: ATPase
Answer: A: ATPase 
Explanation: Ans. (a) ATPaseIn primary active transport, the energy is derived directly from breakdown of ATPOne of these ATPases is sodium-potassium adenosine triphosphatase (Na, K ATPase), which is also known as the Na, K pump