The plasma membrane prevents all potassium ions from leaking out but allows all sodium ions to cross into the cell from the extracellular fluid. True / False.

Answer: FALSE

Explanation:

The plasma membrane has both Na - K channels across it walls. They are membrane transport proteins which hydrolyse ATP s for the active transport mechanisms for transport of sodium and potassium ions across the plasma membranes.

Naturally, there are more potassium ion channels than sodium channels in plasma membrane; potassium is also extracellular while sodium is extracellular

Therefore, when some potassium ions diffused into the Axoplasm, from the extracellular medium;; some potassium ions still move out BACK into the extracellular environments. Not all potassium are restricted from leaving.

This leakage occurs because of more available potassium ions channels than sodium ions, and higher number of available potassium ions

Thus the answer is FALSE

the ratio of diffusion is 3 sodium out to 2 potassium in