<prompt> Ductus venosus connectsPulmonary trunk and IVCRight atrium and left atrumLeft umbilical vein and IVCPulmonary trunk and ascending aoa  <response>: Ductus venosus shunts a poion of the left umbilical vein blood flows directly to the inferior vena cava. Thus, it allows oxygenated blood from the placenta to bypass the liver. BD CHAURASIAS HUMAN ANATOMY.VOLUME 1. 6T H EDITION.PAGE NO 268 