Any agreements entered into between the system and any county hospital, municipal hospital or hospital created by special act of the Legislature shall be subject to the provisions of section three-a, article twenty-three, chapter eight of this code. No agreements entered into by the system shall relieve any hospital of any obligation or responsibility imposed upon it by law, except to the extent that actual and timely performance thereof by the system or any of its members may be offered in satisfaction of the obligation or responsibility.