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Across 1. instrument used to measure electrical activity of the heart 6. artery where blood pressure is normally measured 8. supply blood to area from multiple sources in case of blockage 9. blood from the heart drains into the right atrium via the coronary ___________. 10. specialized capillaries of the liver 11. ventricular relaxation segment of ECG 13. weakened blood vessel wall that may rupture and bleed 15. 2 heart chambers that receive blood 16. cause of heart sounds lubb dupp 17. simple squamous epithelium that lines blood vessels 20. atarial or ventricular relaxation 21. serous and fibrous membranes surrounding heart 22. ventricular systole segment of ECG (2 words) 25. right AV valve 26. lower tip of left ventricle 28. semilunar valve of the right ventricle 29. cell junction that prevents cardiac muscle fibers from pulling apart 30. pacemaker of the heart (abbr. 2words)

Down 1. inner layer of heart wall 2. drains blood from heart to right atrium (2 words) 3. large artery that receives blood from left ventricle 4. division of autonomic nervous system that decreases heart rate 5. prevent the backflow of blood in veins 7. where the velocity of blood flow is the lowest 11. thickest layer in arterial wall 12. blood vessel that carries blood away from the heart 14. main endocrine hormone; increases heart rate 18. muscle layer of heart wall 19. main blood vessel that controls blood pressure 23. atrial or ventricular contraction 24. locationof vasomotor and cardiac centers in the brain 27. atrial contraction segment of ECG (2 words)