Biology topic 3

4. on gill filaments to increase surface area
5. many in companion cells lining the phloem to provide ATP for active transport
7. what is opened by guard cells
10. key word for blood and water flowing in opposite directions in a fish
12. transports sugars in a plant
14. water molecules stick to the wall of the xylem because they are
16. what are pores on an insects called
18. what flattens and contracts when breathing in
19. used in photosynthesis 1 reaction is catalysed by rubisco
20. .... of thoracic cavity increases when breathing in

1. increases rate of gas exchange
2. what does the countercurrent flow maintain
3. transports water in a plant
6. oxygen diffuses through alveoli epithelium through capillary ...... into the blood
8. many of them increase rate of gas exchange in human lungs
9. produced by respiration to provide energy
11. water molecules move up the xylem in a continues column because water molecules are .....
13. adaptation in plant that are in dry environments
15. process of water leaving leaves as water vapour
17. cell open stomata