Across
- 4. Part of the electrical control system of the heart that coordinates the top of the heart
- 5. Part of the cardiovascular system which carries oxygenated blood away from the heart to the body
- 6. The rhythmic contraction (systole) and relaxation (diastole) of the chambers of the heart
- 7. The dividing wall between the right and left sides of the heart
- 9. A vein that carries oxygenated blood from the lungs to the left atrium of the heart
- 11. Contraction of the heart chambers
- 13. Simpler system that exists in vertebrates
- 15. Blood with oxygen
- 16. It is a transthoracic interpretation of the electrical activity of the heart over a period of time
- 18. It is the rapid, irregular, and unsynchronized contraction of muscle fibers
- 19. Two large veins that carry blood with low levels of oxygen
- 21. Blood without oxygen
- 23. The chamber of the heart that receives blood from an atrium and pumps it to the arteries
Down
- 1. The tissue that causes the ventricles to contract simultaneously from the bottom up
- 2. The upper chamber of each half of the heart
- 3. The system that carrys blood and oxygen around our body
- 5. This is a impulse-generating (pacemaker) tissue located in the right atrium of the heart.
- 8. Relaxation of the heart chambers
- 10. Valves through which blood flows from the atria to the ventricles
- 12. Half portion of the cardiovascular system
- 13. Prevents blood from flowing back into the ventricles
- 14. The artery that branches from the aorta to supply blood to the heart
- 17. The muscle tissue of the heart; adapted to continued rhythmic contraction
- 20. Narrowing of the aorta
- 22. Tiny air-filled sacs arranged in clusters in the lungs