The Heart

2. Sensors that detect changes in blood pressure.
4. This is another name for the mitral valve
6. This is the circulation that goes through the lungs to pick up oxygen and release carbon dioxide.
8. The heart has _____ chambers.
11. The walls of the left ventricle are the _________________ because it needs to pump blood through the entire body.
14. These blood vessels’ walls are only one cell thick, which enables the exchange of materials from the blood to cells and from the cells to the blood.
17. Take blood from capillaries to veins.
19. This is a big artery that takes oxygenated blood away from the heart and out to the body.
20. Our circulatory system is a _____________ system.
21. These are the chambers that receive blood.
23. This is the circulation that goes throughout the body.

1. These supply the heart with oxygenated blood.
3. The closing of heart valves makes this sound.
5. These are the chambers that pump blood out of the heart.
7. Take blood from arteries to capillaries; have more smooth muscle tissue than arteries; play a large role in the regulation of blood flow.
9. Large blood vessel with thick walls, smooth muscles and small lumen; takes blood away from the heart.
10. This valve separates the right atrium from the right ventricle.
12. Large blood vessel with thin walls and large lumen; brings blood back to the heart.
13. This valve separates the left atrium from the left ventricle.
15. These blood vessels bring deoxygenated blood back to the heart.
16. This valve prevents deoxygenated blood from moving backward into the right ventricle.
18. Type of muscle tissue that makes up the heart.
22. This valve prevents oxygenated blood from moving backward into the left ventricle.