6.3 Gas Exchange In Fish Flashcards
1
Q
What is the structure of the gills in fish? (3)
A
- gill filaments
- gill lamellae
- countercurrent flow
2
Q
What do the gill lamellae do to the surface area of the gills?
A
Increase the surface area
3
Q
What is the essential feature of a countercurrent flow?
A
Blood and water flow over gill lamellae in opposite directions
4
Q
How does the countercurrent flow work?
A
Oxygenated blood flows past water that has its maximum concentration of oxygen, therefore diffusion takes place because there is a concentration gradient present.
