Question

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 1

Answer: FALSE

Step-by-step 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