CARDIOVASCULAR

2. veins The newly oxygenated blood enters the left atrium of the heart from it.
3. nerves slows the heart rate when there is no need for extra pumping.
5. circulation the blood flow from the heart to tissue capillaries and back to the heart
8. An audible sound associated with the closure of the heart valve
9. the middle, muscular layer of the heart wall, also the thickest layer.
11. normal cycle of the heartbeat starts with themyocardial infarction
12. circulation The circulation of blood through the vessels from the heart to the lungs and then back to the heart again
13. fibrous and membranous sac, surrounds the heart.
17. nnermost layer of epithelial cells.
18. vena cava carries blood from the lower part of the body.
19. nerves speed up the heart rate during conditions of emotional stress or vigorous exercise.

1. smooth layer of endothelial cell that lines the interior of the heart and heart valves.
4. vein The only vein that carry rich oxygenated blood
5. device used to measure blood pressure.
6. Two upper chamber of the heart
7. venae cava drains blood from the upper portion of the body
10. infarction. Another name for heart attack.
14. leads to a vein that brings oxygen-poor blood back to the heart.
15. aorta numerous branches
16. Two lower chamber of the heart
20. heart beat as felt through the arteries walls.