Q. $Na^{+} - K^{+}\$ pump is found in membranes of many cells, like nerve cells. It works against electrochemical gradient and involve of ATP used
A) 3 ions of $Na^{+}\$are pumped out and$\ 2K^{+}are\ taken\ in$
B) 3 ions of $Na^{+}$ are taken in and$\ 2K^{+}are\ pumped\ out$
C) 2 ions of $Na^{+}$are thrown out and$\ 3K^{+}\$are absorbed
D) 3 ions of $K^{+}\$are absorbed, $3Na^{+}are\ pumped\ out$
Explanation
Energy from ATP cause confirmational change in the solute carrier complex. From energy of one ATP, three $Na^{+}$ pumped outside and two $K^{+}$ ions taken in. this process of expelling out $Na^{+}$ ions and drawing in $K^{+}$ ions against the concentration gradient and electrochemical gradient is called sodium-potassium exchange pump of the cell.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.