6.3 - Gas Exchange In Fish Flashcards
(6 cards)
1
Q
Do fish have a large or small surface area to volume ratio?
A
Small
2
Q
What are the gills made up of
A
Gill filaments which have gill lamellae
3
Q
What do the gills made up lamellae do?
A
Increase the surface area of the gills
4
Q
The flow of water over the gill lamellae and the flow of blood within them are in what directions
A
Opposite directions of each other
5
Q
The blood flow and water flow going in opposite direction is called what?
A
Countercurrent flow
6
Q
Why do the blood and water flow in opposite directions?
A
- blood that is already well loaded with oxygen meets water, which has its maximum concentration of oxygen. Therefore diffusion of oxygen from the water to the blood takes place
- blood with little oxygen in it meets water which has had most but not all of its oxygen removed. Again diffusion of oxygen from the water to blood takes place.
