gas exchange in fish Flashcards
1
Q
what are gills comprised of
A
gill filiments
2
Q
what do gill fililments contain
A
gill lamellae
3
Q
why are gill lamellea specicilased/adapted
A
large surface area- faster uptake of water = quicker supply of oxygen
4
Q
what is specilised about fish blood flow
A
it’s counter current model
5
Q
describe the principle in fish of the countercurrent model
A
where the flow of water over the gills is in an opposite direction to the flow of blood within the gills meaning a concentration gradien is always present and can be established
6
Q
explain how the counter current model works in fish
A
blood and water flow in opposite directions ( 1mark)
diffusion/concentration gradient maintained along length of lamella
7
Q
A
