Mechanisms of Gill Ventilation Flashcards
1
Q
Gill ventilation involves a ___. What is it called?
A
- dual pump
- buccal-opercular pump
2
Q
How does dual pump work?
A
- buccal (pressure) PUSHES water across gills while opercular (pressure) PULLS water across gill
3
Q
What does the buccal-opercular pump do?
A
- synchronously delivers near uniform water flow
4
Q
The buccal-opercular pump is ____.
A
- unidirectional
4
Q
What happens to the buccal and opercular cavities when the mouth opens?
A
- floor of mouth drops, putting more water in buccal cavity (pressure pulls water through gill sieve to opercular cavity)
5
Q
How do fish increase ventilation? What does this do?
A
- increase volume, depth of breath and frequency
- supplies water to gill for gas exchange
6
Q
What happens after the floor of the mouth raises?
A
- buccal cavity pushes water to opercular cavity and out of gill
7
Q
What is different about larval lamprey ventilation?
A
- no buccal or opercular pump = velar pump
8
Q
The velum is ___
A
muscular
9
Q
How does water move in the velar pump?
A
- UNIDIRECTIONAL
- in through mouth, through gills and out of pores
10
Q
How does the velar pump and compression-recoil of branchial chamber work?
A
- velum pulls down dragging water in
- compression causes positive pressure which forces water out
- recoil causes negative pressure which pulls more water in through the mouth
11
Q
What fish use tidal ventilation?
A
- parasitic feeders
- mouth is suction cup - cant breathe thru mouth while attached
12
Q
Why cant parasitic feeders use their nostrils while feeding?
A
- they are dead end
13
Q
How do tidal breathers breathe?
A
- in/out branchiophores
14
Q
How do post metamorphic lamprey breathe?
A
via compression recoil
