The Mammalian Heart

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Across
  1. 1. Sound when the ventricles contract
  2. 4. Sounds made from a heart beat
  3. 7. Relaxation of the heart
  4. 10. The valves prevent this
  5. 13. The contraction of the atria's
  6. 16. Connect the valves to the papillary muscles
Down
  1. 2. The valve separating the left atria from the left ventricles
  2. 3. Sound when the ventricles relax
  3. 5. The contraction of the ventricles
  4. 6. Generic term for valves that separate the atriums from the aorta and pulmonary vein
  5. 8. Valve consisting of three flaps
  6. 9. Respiratory pigment that has a greater affinity for oxygen than haemoglobin
  7. 11. Contraction of the heart
  8. 12. The bottom of the heart
  9. 14. Supplies the body with oxygenated blood
  10. 15. Muscle that separates both sides of the heart