The Heart Part 1

2. remnant of the foramen ovale
7. blood vessels draining blood from the cells of the myocardium
8. the pulmonary _______ brings oxygen-poor blood to the lungs
10. simple squamous inner lining of heart-chambers
12. the circuit that brings and removes blood from the lungs
15. superior distributing chambers
16. combination of desmosomes and gap junctions that bind together adjacent cardiac muscle fibers
18. remnant of the ductus arteriosum
21. most superficial layer of the heart wall
23. cells that spontaneously depolarize
27. special action potential feature that shows the entended refractory period of cardiac muscle fibers
28. extensions of the fibrous skeleton that prevent backflow of blood
29. valve separating chambers on the right side of the heart
31. structures in intercalated discs that allow adjacent myocardial cells to share cytoplasm
32. tight intercellular junctions in intercalated discs
34. blood vessels bringing blood to the cells of the myocardium
36. this large blood vessel brings blood away from the left ventricle to the systemic circuit
37. the pulmonary ______ brings oxygen-rich blood from the lungs to the left atrium
39. valves separating ventricles from arteries
40. valves separating atria and ventricles

1. connection between aorta and pulmonary trunk in fetuses
3. also known as the SA node, this node is the pacemaker of the heart
4. also known as the AV node, this node relays the action potential between the atria and ventricles
5. muscles in the wall of the atria
6. hole between atria in fetuses
9. valve separating the right ventricle from the pulmonary artery
11. valve separating the left ventricle from the aorta
13. cation responsible for the plateau
14. skeleton connective tissue "skeleton" of the heart
17. the circuit that brings and removes blood from peripheral or body tissues
19. part of cardiac conduction system in the inferior interventricular septum
20. small nervous tissue fibers that innervate the myocardium of the ventricles
22. double-layered membrane that surrounds the heart
24. valve separating left atrium and ventricle
25. inferior, distributing chambers
26. flap-like extensions of the atria that are used to accommodate overflow
28. these large vessels drain blood from the systemic circuit to the right atrium
30. connective tissue connecting valve flaps to papillary muscles
33. made of cardiac muscle fibers, this is the contractile layer of the heart
35. part of cardiac conduction system in the superior interventricular septum
38. muscles that secure AV valve flaps to the ventricular walls by connecting to chordae tendinae