<prompt> Answer this question truthfullyWhat is the pathway for most of the highly oxygenated blood reaching the heart via the fetal inferior vena cava IVC, and where is it pumped to supply oxygen to the body?  <response>: <reason> Most of the highly oxygenated blood reaching the heart via the fetal IVC is directed from the right atrium RA to the left atrium LA via the foramen ovale and pumped into the aorta to supply the head and body. 