The Na K ATPase is also known as the Na -K pump. It is responsible for maintaining the high extracellular sodium ion concentration and the high intracellular potassium ion concentration. What happens immediately after the pump hydrolyzes ATP?

The options are missing from the question.

A) Na+ is bound

B) ADP is bound

C) The pump is phosphorylated

D) The pump changes conformation

The correct answer to the question is option C

THE PUMP IS PHOSPHORYLATED

Explanation: Sodium potassium pump (Na+ K+ pump) is a mechanism that uses active transport to move sodium Na+ and potassium K+ in and out of cellular compartments (intracellular and extracellular) inorder to maintain a gradient. It is responsible for maintaning a high extracellular sodium ion concentration and a high intracellular potassium ion concentration.

Once the sodium-potassium pump hydrolyses ATP,the pump will become phosphorylated (transmission of signal throughout the cell) lowing the affinity of the pump to sodium,this causes 3 sodium ions to move out of the intracellular compartment into the the extracellular compartment. The pump further brings two potassium ions together causing a dephosphorylation(inhibition of signal transmission throughout the cell) and then moves the 2 potassium ions out of the cell. This mechanism continues till there is a higher extracellular sodium concentration and a high intracellular potassium concentration therefore achieving the desired gradient(optimum)

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