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