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Across 4. Vena Cava that collects deoxygenated blood from the lower part of the body 5. Blood rich in oxygen 8. Heart beat phase where ventricles contract 9. Blood vessels that carry blood away from the heart 10. Heart chambers that collect blood 11. Node that initiates heart muscle contraction found in right atrium 12. Bundle-like cell structures in septum that propagates action potential to lower part of ventricles 13. Blood cells that contain hemoglobin 17. Valves the prevent backflow from ventricles to atria 19. High blood pressure 22. Blood poor in oxygen 24. Cell fragments that are involved in coagulation 25. Microscopic vessels where gas and nutrient exchange takes place 26. Valves the prevent backflow from arteries to ventricles 27. Lipid connected to cardiovascular disease 29. Heart chambers that pump blood out of the heart 30. Vena Cava that collects deoxygenated blood from the upper part of the body 31. The circulation circuit to the lungs 32. The circulation circuit to the "body" 33. Wall that separates the left and right halves of the heart

Down 1. Heart beat phase where ventricles relax 2. First artery connected to the left ventricle 3. The heart's own circulation circuit 6. Hormone that increases the heart rate 7. Blood vessels that carry blood back to the heart 14. Node that recieves and propagate action potential to ventricles 15. Fluid part of the blood 16. Fibers that propagates action potential activating ventricle muscle cells 17. Changes that narrow the arteries leading to increased blood pressure 18. Hard, fatty deposits inside vessel wall 20. Finer branches of arteries 21. Blockage of coronary arteries causing oxygen deprivation and heart cell death 23. Blood cells that fight infection 28. Finer branches of arteries