What returns form the veins to body tissues to the heart?

Deoxygenated blood returns from the body tissues to the heart through the veins. This blood is collected from smaller venules that merge into larger veins, ultimately draining into the superior and inferior vena cavae. These large veins empty the deoxygenated blood into the right atrium of the heart, where it is then directed to the right ventricle for pulmonary circulation to receive oxygen.