1. inside a
Go Fish!

2. Gills Covered by gill slits or operculum Used for O2 and CO2 exchange
Swimming & opening mouth bring in water
Mouth – gills - out

3. Structure keep food out increase the surface area capillaries
cartiledge
support
fleshy projections

4. Function
H2O O2
CO2
Diffusion
Capillary in lamallae
from
body to
heart

5. Function
Diffusion
Capillary in lamallae
from
body to
heart

6. Function
Diffusion
Capillary in lamallae
from
body to
heart

7. Function
Diffusion
Capillary in lamallae
from
body to
heart

8. Fig. 8.15

9. Getting oxygen from water is hard work.
Solution…

10. Countercurrent System of Flow
Result:
No matter where
the blood meets the
water, the O2 of the
water is always
higher = more efficient.
Low O2
Water Flow
High O2
Blood Flow
Low O2
High O2