6.3 - Gas Exchange In Fish Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Where does gas exchange occur in a fish?

A

The gills

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are gills made of and how are they supported?

A

Made of bone or cartilage and supported by the gill bar/arch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the space between the gill bar called?

A

Gill slit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How many rows of filament are there?

A

2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are lamellae?

A

Folds on the filament

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Where does gas exchange occur in a fish?

A

The lamellae

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How big is the distance between the water and the blood cells in the lamellae?
Why is this good?

A
  • 5 micrometers
  • Short diffusion distance
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What prevents the lamellae from collapsing?
How large is the gap between two lamellae?

A
  • the water in between them
  • 50 micrometers
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the two ways fish can ventilate?

A

Passive ventilation and active ventilation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Passive ventilation (2 ways)

A
  • Fish swim forward with their mouth open
  • Fish point they mouth upstream
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are the 5 stages of active ventilation in a fish?

A

1) Mouth opens and operculum closes
2) Buccal floor lowers so the buccal cavity volume increases. As the volume increases, the pressure decreases and the water flows in (like a suction pump)
3) Mouth closes
4) Buccal floor raises so the pressure increases
5) Operculum opens so the water is pushed out through the gills

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Explain counter current flow.

A
  • water and blood flow in opposite directions across the lamellae
  • this maintains a concentration gradient
  • therefore diffusion can occur across the whole length of the lamellae
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Explain parallel flow

A
  • Blood and oxygen flow in the same direction
  • Concentration gradient is harder to maintain
How well did you know this?
1
Not at all
2
3
4
5
Perfectly