anatomy

4. – The artery that carries oxygen-poor blood from the heart to the lungs.
6. – The lower left chamber of the heart that pumps blood to the body.
7. – A large vein that collects blood from the heart muscle and drains into the right atrium.
9. – The wall that separates the left and right sides of the heart.
11. – Large veins that bring oxygen-poor blood from the body to the heart.
13. – Fibers that spread electrical signals through the ventricles, causing them to contract.
16. – The heart muscle that pumps blood.
17. – The upper right chamber of the heart that receives oxygen-poor blood from the body.
18. – The largest artery that carries oxygen-rich blood from the heart to the body.
20. – The lower right chamber of the heart that pumps blood to the lungs.
21. (Bundle of His) – Fibers that carry electrical signals from the AV node to the ventricles.
22. – A group of cells (like the SA node) that control heart rhythm by sending electrical signals.
23. – The smooth inner lining of the heart chambers.

1. – The valve between the left ventricle and aorta that stops blood from flowing backward.
2. – Same as above; part of the pathway for electrical signals in the heart.
3. – A part of the conduction system that delays the heartbeat signal before it moves to ventricles.
5. – The upper left chamber of the heart that receives oxygen-rich blood from the lungs.
8. – The valve between the right ventricle and pulmonary artery that stops blood from flowing backward.
10. – The valve between the right atrium and right ventricle that prevents backflow of blood.
12. – The protective sac around the heart.
14. – The heart’s natural pacemaker that starts each heartbeat.
15. – The valve between the left atrium and left ventricle that prevents backflow of blood.
19. arrest – When the heart suddenly stops beating.