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2. the dividing wall between the right and left side of heart
7. Small mass of cells that slows the electrical current sent by the SA node (located at junction of atria and ventricles)
8. small branch of an artery leading into capillaries
10. provides blood supply that oxygenates and nourishes the heart (branch from base of aorta)
14. the fluid portion of the blood
16. thin sheet of endothelium that lines the heart chambers
17. pressure when the ventricles are relaxing
19. double sac of serous membrane that encloses the heart
20. vessels that carries blood away from the heart

1. discharging chambers of the heart
3. SA node is tiny cell mass in the right atrium of the heart that sets the pace for the whole heart
4. tube that carries oxygen-depleted blood toward the heart
5. wide channel that receives blood from the coronary veins and empties it in the right atrium in the heart
6. a minute blood vessel connecting arterioles with venules
9. amount of pressure in the arteries during contraction of the heart
11. valve between the left atrium and the left ventricle of the heart
12. consists of thick bundles of cardiac muscle twisted into ringlike arrangements
13. amount of blood pumped out by each side of the heart in 1 minute
15. rhythmic expansion and recoil of arteries resulting from heart contraction
18. network of interweaving capillaries supplying an organ