Across
- 3. the waste product formed by the breakdown of excess amino acids in the liver
- 4. a metal mesh placed in a blocked or partially blocked artery.
- 7. the name given to cells that make up the outer layer of an organism.
- 9. the lower layer of mesophyll tissue in plant leaves that contains many large air spaces to give a big surface area for the exchange of gases.
- 12. the cells that surround the stomata in the leaves of plants.
- 13. chambers of the heart that contract to force blood out of the heart.
- 15. the smallest blood vessels.
- 17. blood vessels that carry blood away from the heart.
- 18. the artery that leaves the heart from the left ventricle
- 20. the blood vessels that supply oxygenated blood to the heart muscle.
- 22. the red pigment that carries oxygen around the body in the red blood cells
Down
- 1. drugs used to lower blood cholesterol levels and improve the balance of high- to low-density lipoproteins in the blood
- 2. the living transport tissue in plants that carries dissolved food (sugars) around the plant.
- 5. the movement of sugars from the leaves to the rest of the plant through the phloem
- 6. the non-living transport tissue in plants that transports water from the roots to the leaves and shoots.
- 8. fragments of cells in the blood that play a vital role in the clotting mechanism of the blood.
- 10. the upper layer of the mesophyll tissue in plant leaves.
- 11. They usually carry deoxygenated blood and have valves to prevent the backflow of blood.
- 14. the loss of water vapour from the leaves of plants through the stomata.
- 16. the upper chambers of the heart
- 19. the large artery that takes deoxygenated blood from the right ventricle of the heart to the lungs.
- 21. the clear yellow-liquid part of the blood that carries dissolved substances and blood cells around the body.