Cardiovascular System

2. one of several white blood cells that support your immune system
4. abnormally low amount of platelets
7. the outermost protective layer of the heart
10. fat-filled grooves
11. disorder in which your body produces too many platelets
12. high white blood cell count
15. pieces of very large cells in the bone marrow
17. broad term for cancers of the blood cells
19. wall or partition that divides the heart into chambers
21. relaxed phase of the cardiac cycle when the chambers of the heart are refilling with blood
22. the contractile myocytes of the cardiac muscle
24. a blowing, whooshing, or rasping sound heard during a heartbeat
26. a condition where the body doesn't have enough disease-fighting leukocytes in the blood
27. a type of blood cancer that affects the immune system
29. a large cell that has a lobulated nucleus, is found especially in the bone marrow, and is the source of blood platelets
30. thin, smooth tissue that makes up the lining of the chambers and valves of the heart
31. specialized structure that ensures one-way flow of blood

1. cardiac cycle during which some chambers of the heart contract after refilling with blood
3. a type of white blood cell that is part of the immune system
5. cavity or passage
6. main organ of your cardiovascular system
8. The Ear-shaped pouch inside the atrium of the heart
9. a test to record the electrical signals in the heart
13. a surgical connection between two structures
14. fluid-filled sac that surrounds and protects your heart
16. embryonic tissue where the heart is formed
18. cardiac muscle
20. lower chamber of the heart
23. monolayer of endothelial cells
25. a small, battery-powered device that prevents the heart from beating too slowly
28. a membrane composed of simple squamous epithelial cells of mesodermal origin, which forms the lining of several body cavities