請幫我把下列英文變成中文

1.superior vena cava
2.right atrium
3.ventricle
4.pulmonary artery
5.left ventricle
6.inferior vena cava
7.the coronary arteries carry blood which supply oxygen and nutrients to the heart
8.the heart consists of four chambers
9.the two lower chambers are called atria(atrium)
10.the two lower chambers are ventricles
11.blood flows through the heart chambers in only one direction because there was valves which prevent the blood from flowing backwards
12.the blood vessels