A hinged-panel opening and closing system includes: an anchor designed to be located on a hinged panel; a gear motor designed to be located on a supporting structure; and a movement-enabling component capable of angularly displacing the hinged panel relative to a receiving structure. The movement-enabling component includes: (a) a movement-enabling shaft located on the supporting structure and, at one shaft end, coupled to the gear motor; (b) a spindle located on supporting structure and coupled to the movement-enabling shaft; and (c) a linear element attaching, at a first end, to the spindle and attaching, at a second end, to the anchor such that said linear element extends between the spindle and the anchor.