The carries oxygen-poor venous blood from above the diaphragm from areas of the upper body and extremities into the right atrium. The carries oxygen-poor venous blood of the coronary circulation into the right atrium. The carries oxygen-poor venous blood from below the diaphragm from the areas of the lower body and extremities into the right atrium.

Superior vena cava

Explanation:

Of the two vena cava, the superior vena cava is the large vein without valves that is responsible for conveying de-oxygenated blood from the upper extremities and body (neck, chest, arm and head) above the diaphragm to the right artrium.

Although the superior vena cava is a large vein, it also short; it is about 2 cm wide and 7 cm long.

When there is an obstruction of the superior vena cava, it can result to the enlargement of the veins and could lead to chest pain and breathlessness.

is in the form atp or adenosine triphosphate