<prompt> The electrogenic NaK ATPase plays a critical role in cellular physiology by?Using energy in ATP to extrude 3 Na out of cells in exchange for taking two K4 into the cellUsing energy in ATP to extrude 3K out of cells in exchange for taking Na into the cellUsing the energy in moving Na into the cell or K outside the cell to make ATPUsing energy in moving Na outside of cell or K inside the cell to make ATP  <response>: Ans A Using energy in ATP to extrude 3Na out of the cells in exchange to taking two K into the cells NaK ATPase catalyse the hydrolysis of ATP to adenosine diphosphate and uses energy to extrude three Na from the cell and take two K into the cell for each molecule of ATP hydrolysed. It is therefore said to have a coupling ratio of 3:2 Its activity is inhibited by Ouabain and related digitalis V glycosides which are used for CHF. Active transport of sodium and potassium is a major energy consuming process in the body. In body it accounts for 24 of energy utilized by cells and 70 of energy utilized by neurons.Hormones increasing Na-K ATPase activity are Thyroid hormones Aldosterone Insulin 