<prompt> Excitable tissue at rest is least permeable toNaKCaCI-  <response>: Points to note- Concentration of ionsNa concentration higher in ECF K concentration higher in ICF Cl- concentration higher in ECF- K leak channels allow K to move from ICF to ECFNa is prevented from entering the cell.Thus diffusion is highest for K, then Cl- and least for Na, when the cell is at rest. 