Cardiovascular System

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Across
  1. 5. Carries deoxygenated blood from the body to the heart.
  2. 6. Encloses the heart.
  3. 10. Carries oxygen-poor blood to right side of heart.
  4. 12. Largest artery in the human body.
  5. 13. Blood vessels that carry deoxygenated blood.
  6. 14. Lower cavities of the heart.
Down
  1. 1. Thickest layer of the heart wall.
  2. 2. Receives oxygen-rich blood and sends it to left atrium.
  3. 3. Thin, smooth membrane
  4. 4. The network between arterioles and venules.
  5. 7. Carries oxygen to the body's tissues and carbon dioxide to the lungs.
  6. 8. A colorless cell that circulates in the blood and body fluids and counteracts foreign substances and diseases.
  7. 9. Plays a role in blood clotting.
  8. 11. The upper cavities of the heart.