Transport in Humans

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Across
  1. 2. Arteries have thick ___________ walls to support blood coming from the heart at high pressure.
  2. 5. This blood constituent contains 90% water, with proteins, mineral salts, hormones, food substances and waste products.
  3. 8. white blood cells have this capability which enables them to squeeze through the walls of blood capillaries.
  4. 9. The three functions for blood are transport of substances, ___________, and clotting of blood.
  5. 12. This blood constituent is involved in blood clotting.
  6. 14. Type of white blood cell that can ingest foreign particles.
  7. 15. Type of white blood cell that produce antibodies against microorganisms.
  8. 16. The capillary wall is ______ cell thick to facilitate rapid exchange of substances.
  9. 17. Red blood cells and white blood cells are destroyed in the _________.
Down
  1. 1. Large organisms require a __________ system as diffusion is inadequate to move substances to all cells.
  2. 3. Red blood cells are able to squeeze through capillaries due to this property.
  3. 4. white blood cells are _______________ in shape.
  4. 6. This type of blood vessel connects the artery to the capillaries.
  5. 7. This type of blood vessel connects the vein to the capillaries.
  6. 10. Veins have thinner walls with less elastic tissue compared to arteries as flow of blood is slower and blood pressure lower.
  7. 11. Pigment in red blood cells essential for binding oxygen.
  8. 13. This structure is found in veins and prevents backflow of blood.