cardiovascular system

4. in a large central space, often one that's open and airy.
5. the thin, smooth membrane which lines the inside of the chambers of the heart and forms the surface of the valves.
6. one of two large chambers located toward the bottom of the heart
7. A large vein that carries blood to the heart from other areas of the body
9. blood vessels that carry oxygen-poor blood from the right side of your heart to your lungs.
10. a white blood cell
12. the thick, middle layer of the heart wall, comprised of cardiac muscle tissue
14. another term for platelet.
15. the body's largest blood vessel, responsible for carrying oxygen-rich blood from the heart to the rest of the body

1. blood vessels that transport oxygenated blood from the lungs back to the heart.
2. any of the fine branching blood vessels that form a network between the arterioles and venules.
3. to the heart
8. a type of blood cell responsible for carrying oxygen to the body's tissues
11. keeps the heart in a stable location in the mediastinum, facilitates its movements, and separates it from the lungs and other mediastinal structures.
13. away from the heart