Exchanging substances

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Across
  1. 5. The type of blood vessel that carries blood towards the heart
  2. 6. Found in veins and in the heart to prevent the backflow of blood
  3. 7. The part of the blood that starts the clotting process
  4. 9. The type of blood vessel that carries blood away from the heart
  5. 10. Name of process by which water move in and out of cells
  6. 11. Drugs that kill bacteria but not viruses
  7. 14. The part of the blood that carries oxygen around the body
  8. 16. Name of the gas that moves from the alveoli into the blood
Down
  1. 1. Use of glucose (sugar) in the body
  2. 2. There is a large number of alveoli in the lungs to produce a large what?
  3. 3. The part of the blood that protects the body against infection
  4. 4. Movement of a substance from a high to a low concentration
  5. 8. Produced by the white blood cells to kill pathogens
  6. 12. How many cells thick are the walls of the alveoli?
  7. 13. The part of the blood that transports dissolved substances around the body
  8. 15. The alveoli have thin walls to reduce the diffusion what?