Heart

4. cava Large vein that returns deoxygenated blood to the heart
5. Largest artery in the body, carries oxygen-rich blood to tissues
7. Inner lining of the heart chambers
10. Valve between the left atrium and left ventricle; also called bicuspid valve
12. output Volume of blood the heart pumps per minute
14. Valve between the right atrium and right ventricle
16. Thickest layer of the heart, made of cardiac muscle
17. Circulation that moves blood between the heart and body
18. Circulation that moves blood between the heart and lungs
20. Ability of the heart to generate its own electrical impulses
21. Arteries that supply oxygen-rich blood to the heart muscle

1. Lower chamber of the heart that pumps blood
2. Doctor specializing in heart conditions
3. volume Amount of blood pumped per heartbeat
6. Phase when the heart relaxes and fills with blood
7. Test that measures electrical activity of the heart
8. valve Valve that controls blood flow from the right ventricle to the pulmonary artery
9. Protective sac surrounding the heart
11. Upper chamber of the heart that receives blood
13. Part of the brain that controls heart rate
15. node Pacemaker of the heart, located in the right atrium
17. Phase when the heart contracts and pumps blood
19. node Delays electrical impulse before it reaches the ventricles
20. Valve that controls blood flow from the left ventricle into the aorta