HEART

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Across
  1. 1. Main artery of the body
  2. 5. Valve located between the left atrium and left ventricle
  3. 7. Smallest blood vessels where gas exchange occurs
  4. 9. The 'pacemaker' of the heart
  5. 10. The term for the entire set of heart valves collectively
  6. 11. A type of blood cell responsible for oxygen transport
  7. 12. Blood vessels that carry blood toward the heart
  8. 15. Valve located between the right atrium and right ventricle
  9. 16. Lower chamber of the heart
  10. 18. The period of the heart's relaxation between contractions
  11. 19. Protein in red blood cells that carries oxygen
Down
  1. 2. Blood vessels that carry blood away from the heart
  2. 3. Large vein that brings deoxygenated blood from the body to the right atrium
  3. 4. The process of blood flow from the heart to the lungs and back
  4. 6. The heart's electrical conduction system component that transmits impulses from the atria to the ventricles
  5. 8. Fluid portion of the blood
  6. 10. Blood vessel that supplies oxygenated blood to the heart muscle
  7. 13. Muscular partition between the right and left sides of the heart
  8. 14. Upper chamber of the heart
  9. 17. The period when the heart contracts to pump blood