The balance between potassium and sodium is maintained by ion transporter proteins in the cell membrane.
ðə bˈæləns bᵻtwˌiːn pətˈæsiəm ænd sˈoʊdiəm ɪz meɪntˈeɪnd baɪ ˈaɪɑːn tɹænspˈoːɹɾɚ pɹˈoʊtiːnz ɪnðə sˈɛl mˈɛmbɹeɪn.