I hate this so much RRAAAAHHH(Litarally blood word serch what is this)

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Across
  1. 2. smallest blood vessel
  2. 4. another word for white blood cells
  3. 8. lower cevitys of the heart
  4. 10. middle layer of hearts wall
  5. 12. carries oxygenated blood away from the heart
  6. 13. another word for red blood cells
  7. 14. a large vein that carries blood to the heart
Down
  1. 1. carries blood from lungs to heart
  2. 3. carries deoxygenated blood to the heart
  3. 5. another word for Platelets
  4. 6. carries blood from lungs to the heart
  5. 7. sac that protects the heart
  6. 9. inner wall of heart
  7. 11. largest artery
  8. 15. upper cavitys of the heart