Circulatory System

4. The heart is about the size of your ___.
5. The part of the blood that is responsible for carrying oxygen.
7. Carry blood AWAY from the heart.
10. The place where nutrients enter the bloodstream.
11. Blood with oxygen.
12. Valves in this heart allow blood to flow in ___ direction.
14. Blood without oxygen.
15. The heart is made of this type of muscle.
16. The liquid part of the blood that contains, nutrients, water, minerals, proteins, and sugar.
17. The place where oxygen enters the blood and carbon dioxide leaves the blood.
18. The heart, blood vessels, and blood are all part of the ____ system.
19. The number of liters of blood in the body.

1. The Circulatory System ___ nutrients, water, oxygen, and waste products around the body.
2. The part of the blood that is responsible for clotting and forming a scab.
3. The protein that allows oxygen to stick to a red blood cell.
6. Brings blood back to the heart.
8. The largest artery in the body.
9. The part of the blood that fights off bacteria and viruses.
13. A small blood vessel that connects veins and arteries.
19. The number of chambers in the heart.