GAS EXCHANGE

Found in insects

TRACHEA SYSTEM

Found in insectsHollow tubes throughout the body supplying oxygen –

trachea

TRACHEA SYSTEM

Found in insectsHollow tubes throughout the body supplying oxygen –

tracheaOpen to the outside through holes called spiracles in

the exoskeleton

TRACHEA SYSTEM

Found in insectsHollow tubes throughout the body supplying oxygen –

tracheaOpen to the outside through holes called spiracles in

the exoskeletonTrachea are kept open by circular bands of chitin –

they lead to smaller tubes without chitin bands called tracheoles

TRACHEA SYSTEM

Found in insectsHollow tubes throughout the body supplying oxygen –

tracheaOpen to the outside through holes called spiracles in

the exoskeletonTrachea are kept open by circular bands of chitin –

they lead to smaller tubes without chitin bands called tracheoles

Tracheoles end in a moist ‘skin’ that reaches every cell so oxygen can now diffuse into the cells.

TRACHEA SYSTEM

Found in insectsHollow tubes throughout the body supplying oxygen –

tracheaOpen to the outside through holes called spiracles in

the exoskeletonTrachea are kept open by circular bands of chitin –

they lead to smaller tubes without chitin bands called tracheoles

Tracheoles end in a moist ‘skin’ that reaches every cell so oxygen can now diffuse into the cells.

Some insects can ‘pump’ their body to assist in the gas exchange – like a very simple form of breathing.

TRACHEA SYSTEM

Found in insectsHollow tubes throughout the body supplying oxygen –

tracheaOpen to the outside through holes called spiracles in

the exoskeletonTrachea are kept open by circular bands of chitin –

they lead to smaller tubes without chitin bands called tracheoles

Tracheoles end in a moist ‘skin’ that reaches every cell so oxygen can now diffuse into the cells.

Some insects can ‘pump’ their body to assist in the gas exchange – like a very simple form of breathing.

Insects blood is clear because it doesn’t carry gases

TRACHEA SYSTEM

Found in insectsHollow tubes throughout the body supplying oxygen –

tracheaOpen to the outside through holes called spiracles in

the exoskeletonTrachea are kept open by circular bands of chitin –

they lead to smaller tubes without chitin bands called tracheoles

Tracheoles end in a moist ‘skin’ that reaches every cell so oxygen can now diffuse into the cells.

Some insects can ‘pump’ their body to assist in the gas exchange – like a very simple form of breathing.

Insects blood is clear because it doesn’t carry gasesThis type of gas exchange system has kept insects

small.

TRACHEA SYSTEM

http://www.youtube.com/watch?v=CVP_PY0ZsOIhttp://www.youtube.com/watch?v=fL0JwCD4mKI

HANDY INFORMATION TO READ

http://www.youtube.com/watch?v=aPF00PzUGzc

TO WATCH

Gills – external to the body, constantly bathed in water

GAS EXCHANGE IN FISH

Gills – external to the body, constantly bathed in water

Made of thin filaments supported by bony structures – each filament is composed of delicate plates containing many capillaries so look dark red.

GAS EXCHANGE IN FISH

Gills – external to the body, constantly bathed in water

Made of thin filaments supported by bony structures – each filament is composed of delicate plates containing many capillaries so look dark red.

In bony fish, the gills are protected by a covering called the operculum

GAS EXCHANGE IN FISH

Gills – external to the body, constantly bathed in water

Made of thin filaments supported by bony structures – each filament is composed of delicate plates containing many capillaries so look dark red.

In bony fish, the gills are protected by a covering called the operculum

In cartilaginous fish (sharks) – gills are open to the water as slits down the side of the body.

GAS EXCHANGE IN FISH

Gills – external to the body, constantly bathed in water

Made of thin filaments supported by bony structures – each filament is composed of delicate plates containing many capillaries so look dark red.

In bony fish, the gills are protected by a covering called the operculum

In cartilaginous fish (sharks) – gills are open to the water as slits down the side of the body.

Fish continuously pump water through the mouth and over the gills to exit at the back of the operculum.

GAS EXCHANGE IN FISH

Gills – external to the body, constantly bathed in water

Made of thin filaments supported by bony structures – each filament is composed of delicate plates containing many capillaries so look dark red.

In bony fish, the gills are protected by a covering called the operculum

In cartilaginous fish (sharks) – gills are open to the water as slits down the side of the body.

Fish continuously pump water through the mouth and over the gills to exit at the back of the operculum.

Sharks have to keep in constant motion to maintain a flow of water

GAS EXCHANGE IN FISH

This process is called ventilation – any method that increases the flow of the respiratory medium (either water or air) over the respiratory membranes.

GAS EXCHANGE IN FISH

This process is called ventilation – any method that increases the flow of the respiratory medium (either water or air) over the respiratory membranes.

The capillaries in the gills are set up so gas can be diffuses easier – the blood flow is opposite to the water flow.

GAS EXCHANGE IN FISH

This process is called ventilation – any method that increases the flow of the respiratory medium (either water or air) over the respiratory membranes.

The capillaries in the gills are set up so gas can be diffuses easier – the blood flow is opposite to the water flow.

This means that the blood coming into the capillary meets new water full of oxygen – this is counter-current exchange.

GAS EXCHANGE IN FISH

This process is called ventilation – any method that increases the flow of the respiratory medium (either water or air) over the respiratory membranes.

The capillaries in the gills are set up so gas can be diffuses easier – the blood flow is opposite to the water flow.

This means that the blood coming into the capillary meets new water full of oxygen – this is counter-current exchange.

It makes the oxygen take-up so efficient, a fish can get 80% of the oxygen out of the water.

GAS EXCHANGE IN FISH