Members of the council, the legislative and policy making branch of the city, shall devote so much of their time to the duties of their office as an efficient and faithful discharge thereof may require. They shall attend all meetings of the council unless lawfully excused therefrom by the mayor or by a majority of the remaining members, and perform all duties which by the nature of their office they should reasonably perform, such as the passing of ordinances, resolutions and the investigation and study of work done for the city according to the committees upon which they may severally be appointed by the mayor. (1962 Code)