Answer the following question given this paragraph: 

The right atrium receives all of the systemic venous return. Most of the blood flows into either the superior vena cava or inferior vena cava. If you draw an imaginary line at the level of the diaphragm, systemic venous circulation from above that line will generally flow into the superior vena cava; this includes blood from the head, neck, chest, shoulders, and upper limbs. The exception to this is that most venous blood flow from the coronary veins flows directly into the coronary sinus and from there directly into the right atrium. Beneath the diaphragm, systemic venous flow enters the inferior vena cava, that is, blood from the abdominal and pelvic regions and the lower limbs.


Q: The right atrium receives all of the systemic venous return. most of the blood flows into either the superior vena cava or this?

 Choices:

- resulted vena cava

- identical vena cava

- exterior vena cava

- inferior vena cava

A:
inferior vena cava
