The Cardiovascular System

2. – The muscular organ that pumps blood throughout the body.
5. – The largest artery in the body.
6. – The medical term for high blood pressure.
10. – The wall that separates the left and right sides of the heart.
14. – The smallest blood vessels where gas exchange occurs.
15. – The two large veins that bring blood back to the right atrium.
17. – These blood vessels carry blood away from the heart.
18. – The innermost lining of the heart that contains part of its electrical conduction system.
20. – The relaxation phase of the cardiac cycle.

1. – Another name for the sinoatrial (SA) node, which controls the heart’s rhythm.
3. – An irregular heartbeat caused by electrical disturbances.
4. – This artery carries deoxygenated blood to the lungs.
7. – The valve between the right atrium and right ventricle.
8. – The contraction phase of the cardiac cycle.
9. – The outer lining of the heart that protects it.
11. – The thick muscular layer of the heart responsible for contraction.
12. – Another name for the mitral valve, located between the left atrium and left ventricle.
13. – These blood vessels transport blood back to the heart.
16. – Tissue death caused by a lack of oxygen, commonly known as a heart attack.
19. – A condition where there is a lack of blood flow to the heart muscle.