Question

in the sodium - potassium pump, how many potassium (k⁺) ions are exchanged for every three sodium (na⁺) ions?
a one
b two
c three
d four

Explanation:

The sodium - potassium pump is a well - studied cellular mechanism. For every three sodium ($Na^+$) ions pumped out of the cell, two potassium ($K^+$) ions are pumped into the cell. This is an important process for maintaining the electrochemical gradient across the cell membrane.

Answer:

B. two