What do you know about the circulatory system?

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Across
  1. 2. (Singular) Blood vessels that carry blood towards the heart
  2. 3. (One word) The system that involves the lungs and the circulation of blood for oxygen exchange
  3. 5. Lower chambers of the heart
  4. 6. The liquid part of blood, carrying nutrients and waste
  5. 8. Muscular organ that pumps blood throughout the body
  6. 10. (Singular) Upper chambers of the heart
  7. 12. A component of blood that helps in clotting and healing wounds
Down
  1. 1. A protein in red blood cells that carries oxygen
  2. 4. The liquid part of blood (About 55% of blood volume contains this)
  3. 7. (Singular) Blood vessels that carry blood away from the heart
  4. 9. Organ where gas exchange with deoxygenated blood occurs
  5. 10. Largest artery in the body
  6. 11. Vein that carries deoxygenated blood into the heart (hint: theres two; superior and inferior)