cardiovascular system

4. branching blood vessels that form a network between the arterioles and venules, has wall of single layer of cells, and very small lumen
6. the exchange of O2 and CO2 between the air and the bloodstream
9. a large vein that carries deoxygenated blood from the upper body and head back to the heart.
12. The sound of heart when the two AV valves close
13. a vein that carries oxygenated blood from the lungs back to the left atrium.
15. artery responsible for carrying deoxygenated blood from right ventricle to the lungs for oxygenation.
16. major vein that carries deoxygenated blood from the lower body back to the heart.

1. Tissue structures that ensure the unidirectional flow of blood through the heart.
2. a heart chamber that propels blood to the rest of the body
3. heart chambers that receive blood and contract to push it into the ventricles
5. a muscular organ responsible for pumping blood throughout the body via blood vessels
7. a heart chamber that propels blood to the lungs
8. The sound of heart when the pulonary and aortic valve close
10. largest artery in the human body, responsible for carrying oxygen-rich blood away to the rest of the body
11. A blood vessel that carries deoxygenated blood to the heart, has thin outer wall, large lumen, and thin media
14. A blood vessel that carries blood from the heart to tissues and organs in the body, has thick outer wall, small lumen, and thick media