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The functions and duties of the Commissioners heading the executive departments referred to in this title, which are imposed upon them by this Code or other laws, shall be performed by them, or, subject to their supervision and direction, by such officers, employees, divisions, bureaus, or other bodies or groups within their respective departments as they designate.\nThis section shall not be construed as conferring any power on the Commissioners to delegate their duty to administer and supervise their respective departments, to serve on boards or commissions, or to issue rules or regulations, as prescribed by law, or their duty to have the ultimate responsibility for the proper performance of the functions vested in them or their respective departments.