64. Na+/K+ pump in a cell is an example of: A. Passive transport B. Diffusion C. Osmosis D. Active transport
Option D Sodium potassium pump is a type of coupled or co-transport in which transport of one ion along the concentration gradient is coupled to the transport of another ion against the concentration gradient. It is neither diffusion nor passive transport nor osmosis. In active transport, ATP supplies the needed energy to pump sodium and potassium against the concentration gradient. Usually, sodium is present in the higher amount outside the cell, while potassium is present in high concentration inside the cell. In sodium potassium pump three sodium ions are exchanged for every two potassium ions.
