THE MAMMALIAN HEART

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Across
  1. 2. Valve between the left atrium and ventricle
  2. 4. Chamber at the top of the heart
  3. 7. Carry deoxygenated blood back to the heart
  4. 10. Have thick, muscular Tunica media
  5. 12. The large artery that carries blood from the heart to the body
  6. 13. The fibres that help the heart beat are _____.
  7. 14. The muscle chamber at the bottom of the heart
  8. 16. The blood that enters the heart from the body is ____.
  9. 18. Inner layer of the heart wall
  10. 20. Sinoatrial Node
  11. 21. Cardiovascular disease
  12. 22. Perform osmosis with cells
Down
  1. 1. Outer layer of the heart wall
  2. 3. The hardening of the arteries caused by plaque
  3. 5. The whole in the middle of a blood vessels
  4. 6. Stops blood flowing backwards
  5. 8. Cardiac Muscles are made of _______ cells
  6. 9. The contraction of the heart muscle
  7. 11. The valve between the right atrium and ventricle
  8. 15. The protective case on the outside of the heart
  9. 17. The relaxation of the heart muscle
  10. 18. The cells in the inner lining of a blood vessel
  11. 19. Middle layer of the heart wall