gill of fish

Question 1

Oxygen dissolves less readily in water

A given volume of air contains 30 times more oxygen than the same volume of water

Fish are adapted to directly extract

Answer 1

oxygen from water

Question 2

Fish have a
Series of………………… on each side of the head

Each …… arch is attached to two stacks of …………………..

Answer 2

gills

gill

filaments

Question 3

On the surface of each filament, there are rows of

Answer 3

lamellae

Question 4

The lamellae surface consists of a

Answer 4

single layer of flattened cells that cover a vast network of capillaries

Question 5

The capillary system within the lamellae ensures that

Answer 5

the blood flow is in the opposite direction to the flow of water - it is a counter-current system

Question 6

The counter-current system ensures the

Answer 6

concentration gradient is maintained along the whole length of the capillary/lamalee

Question 7

The water with the lowest oxygen concentration is found adjacent to the

Answer 7

most deoxygenated blood

Question 8

The filaments in fish gills are organized in

Answer 8

rows/stacked in the gill arch and lots of them increase surface area and has lots of thin membranes short diffusion distance

Question 9

Also many lamellae on filaments which increases what

how are lamellae found

Answer 9

increase surface area

at right angles to the filaments or stacks

Question 10

Counter current blood and water move in … what directions

which maintains what

and allows gas exchange along whole of what

AND where is there more oxygen so oxygen will diffuse from where

Answer 10

opposite

concentration gradient

blood capillary

More oxygen in water so oxygen moves into blood from water