<span>Carcinogens are substances that are commonly known to cause cancer. The condition that might occur when a substance causes unregulated and uncontrolled cell growth and development is called cancer. Cancer can be life-threatening because the cells will grow rapidly causing tumor development. As the tumors become larger, there is a greater chance that the cells can spread to surrounding cell structures or body organs.</span>
<h2>Answer </h2>
Blood is carried by a Superior and Inferior Vena Cava toward the heart
<u>Explanation </u>
Most veins transport deoxygenated blood through the tissues returning to the heart except pulmonary and umbilical vein that transfers oxygenated blood to the heart whereas arteries carry blood away from the blood. The main blood vessels aorta, superior vena cava, and inferior vena cava carry deoxygenated away from the heart to lungs while pulmonary veins carry the oxygenated that is oxygen-rich blood from lungs to the heart.
