While in her hepatocyte, you notice that a molecule of carbon dioxide has just been produced. 1 Trace the carbon dioxide's pathway from Ms. Magenta's hepatocyte through the systemic veins to her heart, then through her heart to the pulmonary circuit, and, finally, through the pulmonary circuit to her pulmonary capillaries. You will likely need to review Unit 18 (p. 481) for some help with this. Start: Hepatocyte Fnd: Pulmonary Capillaries.