Vena Cava - GCSE Biology Definition

The vena cava is the largest vein in the human body and plays a vital role in the circulatory system by returning deoxygenated blood to the heart. It is divided into two main parts: the superior vena cava, which carries blood from the head, neck, and arms, and the inferior vena cava, which carries blood from the lower parts of the body, such as the abdomen and legs. Both veins transport blood into the right atrium of the heart, where it is then pumped to the lungs to be oxygenated. In GCSE Biology, students learn that this process is essential for maintaining the continuous circulation of blood around the body and for ensuring that tissues receive a constant supply of oxygen and nutrients.