Path model of non-exchangeable potassium (neK, solid line for double arrow, dashed-line for single arrow, and single arrow flows into ZwsK).

Path model of non-exchangeable potassium (neK, solid line for double arrow, dashed-line for single arrow, and single arrow flows into ZwsK).不可交换钾（non-exchangeable potassium，简称neK）的路径模型：实线代表双箭头，虚线代表单箭头，且单箭头流向ZwsK。