M2 CIRCULATORY SYSTEM2

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Across
  1. 3. Tiny blood vessels in the tissues form vast networks called (9,4)
  2. 7. Smaller arteries
  3. 9. The biggest vein in the human body (4,4)
  4. 11. Fancy name describing the innermost tunic of a blood vessel
  5. 13. The biggest artery in the human body
  6. 15. The tiniest blood vessels of all
  7. 16. A blue mark on the body that indicates that there is bleeding under the skin
  8. 18. Vasodilation of blood vessels in the cheeks when you’re embarrassed
  9. 19. Big arteries contain this protein to make them more balloon like and ‘elastic’
Down
  1. 1. Blood vessels that carry blood away from the heart
  2. 2. Caused by the relaxation of smooth muscles in the arteries
  3. 4. Caused by the contraction of smooth muscles in the arteries
  4. 5. Fancy name describing the middle tunic of a blood vessel
  5. 6. Blood vessels that carry blood to the heart
  6. 8. Fancy name describing the outermost tunic of a blood vessel
  7. 10. Describes the type of muscle found in the tunica media
  8. 12. These structures are found within veins and stop backflow
  9. 14. Smaller veins
  10. 17. The open space at the centre of a vessel