Gas Exchange in Fish and Countercurrent Systems Flashcards
1
Q
what is the gas exchange surface in fish
A
the gills
2
Q
describe fish gill anatomy
A
-4 layers on each side of fish head
- gills are made up of stacks of gill filaments
- each gill filament is covered in gill lamallae
3
Q
what is the gas exchange site on the gill
A
the lamallae
4
Q
how is there a short diffusion pathway in gills
A
capillary network in every lamallae
5
Q
how is conc gradient maintinaed
A
counter current flow
6
Q
how does countercurrent flow ensure gas exchange
A
ensures that equilibrium is not reached by making the water flow over the gills in the opposing direction to blood in tthe capillaries
