This act creates a department of finance to administer the finances of the county for all funds handled by the county trustee. The department of finance is under the supervision of a director of finance and subject to the policies and regulations adopted by a county financial management committee. Generally the finance department is responsible for purchasing, accounting, budgeting, payroll, cash management, and other fiscal matters of the county. T.C.A. § 5-21-103. The specific provisions setting out the functions of the finance department can be found in the following statutes: