Gas exchange in fish

Edit Answers
123456789101112
Across
  1. 2. each gill is supported by one
  2. 3. tiny structures that increase surface area further
  3. 7. the idea that blood flows through the gill plates in one direction and water flows through in the opposite direction
  4. 8. the other name for secondary lamellae
  5. 10. Each gill is made up of lots of these thin branches and they have another name
  6. 11. oxygenated water enters through mouth and exits through this
  7. 12. increase surface area for gas exchange they are the same thing as the previous question
Down
  1. 1. something the gill plates have a lot of
  2. 4. the concentration of oxygen in the water is always ... than in the blood
  3. 5. this is maintained by the counter current system
  4. 6. therefore as much oxygen as .... diffuses into the blood
  5. 9. something that speeds up diffusion in the secondary lamellae