The Cardiovascular System

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Across
  1. 2. Largest artery in the body.
  2. 4. The substance to which oxygen and carbon dioxide attach .
  3. 6. The heart is divided into four parts called _____________.
  4. 10. The cell that destroys harmful organisms.
  5. 11. The two lower chambers of the heart that receive blood second.
  6. 13. A flap of tissue that prevents blood from flowing backward.
Down
  1. 1. (Singular) upper chambers of the heart.
  2. 3. Hollow, muscular organ that pumps blood throughout the body.
  3. 5. Red blood cells.
  4. 6. The smallest blood vessels connecting arteries and veins.
  5. 7. The movement of blood through the blood vessels.
  6. 8. Right side valve between Right Atrium and the Right Ventricle.
  7. 9. The cells that carry oxygen and carbon dioxide through the body.
  8. 12. A measure of your heartbeat.