blood flows into the heart through the upper vena cava to the
Blood from the body flows: 1  to the superior and inferior vena cava, 2  then to the right atrium. 3  through the tricuspid valve. 4  to the right ventricle. 5  through the pulmonic valve. 6  to the pulmonary artery. 7  to the lungs.lood Flow. All blood enters the right side of the heart through two veins: The superior vena cava (SVC) and the inferior vena cava (IVC) (see figure 3).