Fill in the blanks:
A large vein called the 1.------- -brings blood from the upper part of the body to the heart, where it enters the 2.----------------. The blood is pumped out of the right atrium into the 3.-------- and travels through the 4---------- to the 5.------ -------- ,where it picks up oxygen . From the lungs, blood travels through the 6.------- -and returns to the heart, where it enters the 7.-------. Finally, the blood is forced from the 8-------- into the 9. -----------, which carries it to the tissues of the body.