Physiology Which of them is TRUE about Na+-K+ pump: A 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. 💡 Explanation Which of them is TRUE about Na+-K+ pump: ✓ Correct Answer: A. K+ is pumped against the gradient.