There is created in the state treasury the “medical student loan for service fund”. All money appropriated for loans to medical students under the Medical Student Loan for Service Act shall be credited to the fund. All payments of principal and interest on loans made pursuant to that act received by the commission [department] shall be deposited with the state treasurer to the credit of the fund. All payments of funds for loans shall be made upon vouchers signed by the designated representatives of the commission [department].