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2. A gas transported by red blood cells that is essential for cellular respiration.
3. A mass of platelets that forms a temporary seal on a vessel wall is called a platelet _____.
4. The valve that prevents backflow into the right ventricle.
5. The iron-containing protein in red blood cells that carries oxygen.
8. The liquid component of blood that carries cells, nutrients, and hormones.
10. The chamber that receives deoxygenated blood from the body.
11. Space between the lungs beneath the sternum where the heart resides.
14. Another name for platelets.
17. The largest vein in the body.
23. Relating to connective tissue or fibers, as in part of the pericardium.
26. The formation process of blood.
28. The blood vessel carrying oxygenated blood from lungs to heart.
31. The outermost layer of the heart wall.
32. Two lower chambers of the heart.

1. Double-walled sac surrounding the heart and root of the great vessels.
3. The circulation loop carrying blood between heart and lungs.
6. The substances the heart transports to provide energy and sustain cells.
7. The chemical messengers transported by the blood to regulate body functions.
9. Unwanted substances transported by the blood to be excreted from the body.
12. The heart's inner layer.
13. The valve that prevents backflow into the left atrium.
15. Term for blood clotting.
16. The circulation loop carrying blood between heart and body.
18. Blood contains more of this formed element than any other.
19. The only layer of the heart that contracts.
20. The cell fragments that help with blood clotting.
21. The chamber that pumps oxygenated blood to the body.
22. The largest artery in the body.
24. Blood Cells The cells responsible for carrying oxygen throughout the body.
25. The waste product removed by the blood and expelled through the lungs.
27. The type of cells that fight infections and support the immune system.
29. The smallest blood vessels where gas exchange occurs.
30. Stopping bleeding.