Anatomy + Function of Fish Gill Flashcards
1
Q
Why is the gill the most efficient gas exchange organ in vertebrates?
A
- low O2 available
- costly to breathe
- has to be
2
Q
What is the buccal cavity?
A
- mouth
3
Q
How does water move through the fish?
A
- mouth/buccal cavity –> gills –> opercular cavity –> operculum –> opening exit
4
Q
What does water pass from BC to OP?
A
- pairs of filaments
5
Q
What is the lamella?
A
- respiratory surface
- water flows through
6
Q
The SA of lamella is ___. This is because:
A
- large because there are a lot of them
7
Q
The distance of travel in lamella is ____. This is because:
A
- small because there are thin epithelium and endothelium
8
Q
Epithelium is on the ____ of the lamella and endothelium is on the ___.
A
- outside vs inside
9
Q
What are Pavement cells?
A
- flat cells
10
Q
What are pillar cells?
A
- endothelial-like cells
- thin flanges
11
Q
What is the function of pillar cells? (4)
A
- line blood space
- maintain integrity
- contractile (decrease blood flow when contracted)
–> regulate blood flow
12
Q
How is non-respiratory blood supplied to the gills?
A
- via venolymphatic vessels and basal blood vessels
13
Q
What do venolymphatic vessels do?
A
- supply nutrients
- take away waste
14
Q
Where is non-respiratory blood?
A
- within filament
15
Q
What do basal blood vessels do?
A
- shunt/bypass blood from gas exchange (far from water)
