unit 3; gas exchange in fish Flashcards
1
Q
define countercurrent flow
A
flow of water over gill lamellae and flow of blood within gill lamellae are opposite
2
Q
effects of countercurrent flow system
A
80% of available oxygen can be absorbed, diffusion gradient maintained along entire length of gill lamellae
3
Q
describe the structure of gills
A
located behind fish head, gill filaments attached to a gill bar stacked on top of each other with gill lamellae running perpendicular on them,
