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Across 2. Relaxation phase of heartbeat 3. Abnormal heart sound 5. The left ventricle propels the blood through this 12. Drains blood from the upper portion of the body 14. Blood leaving the pulmonary valve flows into this 16. Branches to carry blood all over the body 19. Also known as bundle of His 20. Has the thisckest walls of all four heart chambers 21. Newly oxygenated blood enters this to go through the heart 22. Contraction phase of heartbeat 23. Pacemaker of heart 24. Oxygen enters the capillaries of the lungs and is brought back to the heart via these

Down 1. Thin walled upper right chamber of the heart, sends low oxygen blood to lungs 4. lower right chamber of the heart 6. Seperates the two upper chambers of the heart 7. Lines the interior of the heart and heart valves 8. Carries blood from the lower part of the body 9. Record used to detect electrical changes in heart muscle as the heart beats 10. Surrounds the heart 11. A muscular wall, comes between the two lower chambers 13. The walls of the left atrium contract to force blood through this 15. Right atrium contracts to force blood through this 17. Right ventricle contracts to pump oxygen-poor bkiid through this 18. Middle muscular layer of the heart wall, thickest layer