[OLD] fish gas exchange Flashcards
1
Q
describe the Gill plate
A
filament on bone, lamellae on filament
2
Q
what is the advantage of countercurrent flow
A
it maintains the diffusion gradient over the full length of the capillary
it maintains the difference in concentration
3
Q
Where does water enter and leave a fish?
A
enters through the mouth, out through the operculum/gills
4
Q
what is underneath the operculum?
A
the gills
5
Q
why is water always lost from the gas exchange surfaces of terrestrial organisms?
A
water evaporates from the gas exchange surfaces as they tend to be moist to improve rate of diffusion
6
Q
what makes a good exchange surface?
A
good blood supply
moist
large SA
thin
