Transport in Humans

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Across
  1. 3. to prevent backflow of blood
  2. 5. shape of red blood cells
  3. 7. bottom half of the heart
  4. 8. makes up most of blood
  5. 9. a cause of coronary heart disease
  6. 10. linking heart to kidneys
  7. 13. involved in clotting
  8. 14. process whereby materials are exchanged
Down
  1. 1. one cell thick blood vessel
  2. 2. blood vessel contain valves
  3. 4. largest artery in the body
  4. 6. top half of the heart
  5. 8. linking heart to lungs
  6. 11. blood vessel with thick muscular wall
  7. 12. present in red blood cells to bind to oxygen