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
[{'content': 'Which of them is TRUE about Na –  - K+ pump \nSelect and explain. \nA. K+ is pumped against the gradient, B. 2K+ are exchanged with 5Na+, C. Hypercalcemia causes arrest in Na+ K+ pump, D. Increase in intracellular Na+ increases action potential', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In Na+-K+ exchange, 3 Na+ goes out and 2K+ goes into the cell with the utilization of ATP. \nHence it is a primary active transport. Due to the net flow of Na+ outwards, there is a potential difference that occurs. Both\xa0Na+ \xa0and\xa0K+ \xa0are pumped against a concentration gradient by using ATP.', 'role': 'assistant'}]