The potassium and sodium cations can diffuse down their concentration gradients because the cell has leaky channels that allow them to do so. The number of potassium leakage channels in neurons is significantly higher than that of sodium leakage channels.
Ion channels that mostly pass through K+ are perhaps the most prevalent. Almost all animal cells have these channels in their plasma membranes. Since a significant portion of K+ channels remain open even in an unstimulated cell, they are sometimes referred to as K+ leak channels.
A lot of potassium leaks out of the neuron through potassium leakage channels because the neuron cell membrane is extremely permeable to potassium ions (holes in the cell wall).
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