B2.2 The challenges of size

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Across
  1. 2. distance over which a molecule diffuses
  2. 6. an area where materials are interchanged
  3. 9. apparatus used to measure rate of water uptake in a plant
  4. 10. lower chamber of the heart
  5. 13. finger-like projections on the intestine wall, which increase the surface area
  6. 14. movement of sugars from the leaf to stores in the roots, or to growing areas of a plant
  7. 16. a system in which blood travels through the heart twice in each circuit of the body
  8. 18. blood vessel that carries blood away from the heart
  9. 20. blood vessel that carries blood towards the heart
Down
  1. 1. a membrane which only allows certain molecules to pass through it
  2. 3. tissue that transports dissolved sugar around a plant
  3. 4. loss of water from the leaves of a plant
  4. 5. muscular organ which pumps blood around the body
  5. 7. tissue that transports water around a plant
  6. 8. small blood vessels that carry blood close to all cells in the body. They link arterioles and venules
  7. 11. air sac in the lung which increases the surface area
  8. 12. small openings (pores) in a plant’s epidermis used to exchange gases (singular – stoma)
  9. 13. structure that controls the direction of flow
  10. 15. upper chamber of the heart (singular – atrium)
  11. 17. the open channel within a tube
  12. 19. the flow of water through a plant caused by the loss of water from a plant’s leaves