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3. This organ pumps life throughout your body.
4. The main artery that carries oxygen-rich blood away from the heart.
6. The system that includes the heart and all the blood vessels.
9. A protein in red blood cells that binds oxygen.
10. A type of blood cell involved in clotting.
13. These help control the direction of blood flow within the heart.
15. The type of blood cell that carries oxygen to all parts of your body.
17. The overarching system responsible for blood circulation and transport of nutrients.
20. The smallest blood vessels where oxygen and nutrients are exchanged with cells.

1. A type of blood cell that helps your immune system fight infections.
2. Lower chambers of the heart that pump blood out to the lungs and body.
5. These vessels carry blood back to the heart.
7. Found inside your bones, this tissue is crucial for producing blood cells.
8. Any substance that provides the necessary elements for growth and health.
11. The part of your heart that receives blood from the body or the lungs.
12. The rhythmic beat felt when blood is pumped through the arteries.
14. The main component of your circulatory system.
16. A vital gas that blood cells transport to every part of your body.
18. A type of blood vessel that carries oxygenated blood away from the heart.
19. The liquid part of your blood that carries important proteins and nutrients.