What type of blood do the vena cavae carry to the right atrium?

The vena cavae are large veins that transport deoxygenated blood from various parts of the body back to the heart. Specifically, the superior vena cava collects blood from the upper body, including the head, neck, and arms, while the inferior vena cava carries blood from the lower body, such as the abdomen and legs. This blood is low in oxygen and high in carbon dioxide due to the metabolic activities of the body's tissues. Once the deoxygenated blood reaches the right atrium, it is then directed into the right ventricle and subsequently sent to the lungs via the pulmonary arteries for oxygenation. Thus, the primary function of the vena cavae is to return deoxygenated blood to the heart, establishing their role in the systemic circulation loop.