Circulatory System

2. Brings blood back to the heart.
3. The number of chambers in the heart.
6. The part of the blood that fights off bacteria and viruses.
10. Valves in this heart allow blood to flow in ___ direction.
11. The largest artery in the body.
13. Carry blood AWAY from the heart.
14. The protein that allows oxygen to stick to a red blood cell.
15. The Circulatory System ___ nutrients, water, oxygen, and waste products around the body.
16. The heart is about the size of your ___.
17. Blood with oxygen.
18. Blood without oxygen.
19. A small blood vessel that connects veins and arteries.

1. The heart, blood vessels, and blood are all part of the ____ system.
4. The place where nutrients enter the bloodstream.
5. The liquid part of the blood that contains, nutrients, water, minerals, proteins, and sugar.
7. The heart is made of this type of muscle.
8. The place where oxygen enters the blood and carbon dioxide leaves the blood.
9. The part of the blood that is responsible for clotting and forming a scab.
12. The part of the blood that is responsible for carrying oxygen.
16. The number of liters of blood in the body.