Gas Exchange In Fish Flashcards

1
Q

Is there a higher concentration of oxygen in water or air

A

Air has a higher concentration of oxygen than water

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2
Q

What do bony fish have? What does this do

A

Bony fish have an operculum. This helps to maintain a flow of water even when stationary

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3
Q

Do cartilaginous fish have an operculum? What do they have to do

A

No, they have to keep moving in order to have a continuous flow of water

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4
Q

Do bony fish or cartilaginous fish have an operculum

A

Bony

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5
Q

How does gas exchange work in fish

A

Water comes in to the fish via the mouth. It then passes out through the gills

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6
Q

What are gills made of

A

Lots of thin plates called filaments

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7
Q

What are filaments covered in? What does this do

A

Structures called lamellae.
This increases the surface area of the gills

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8
Q

Apart from filaments, what else do gills have? What does this do

A

Lots of capillaries and a thin membrane to speed up diffusion

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9
Q

How are fish gills adapted for gas exchange

A

Filaments are covered in lamellae for increased surface area for gas exchange
There are lots of capillaries and the walls are thin to speed up diffusion

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10
Q

What is a countercurrent system? What does this do

A

The blood system in the lamellae is arranged so that water flows in the opposite direction to the blood flow in the capillaries. This makes gas exchange more efficient

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11
Q

What does water and blood flowing in opposite directions mean

A

It means diffusion will always occur DOWN a concentration gradient so the water will always have a higher concentration of oxygen than the blood no matter its position in the gills

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12
Q
A
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