Gas Exchange Surface Adaptations

1
Gas Exchange Surface Adaptations

• All the larger animals have evolved an improved
  way of getting oxygen into the cells of their
  bodies and getting carbon dioxide out of their
  bodies.
• Complete the details of how the following
  animals gas exchange surfaces.
• Then try to work out the  Five Universal
  Features of Gas Exchange Surfaces 

2
Humans have lungs

• It is in the lungs that the gas exchange occurs.

3
Fish have Gills

• The air goes into their gills and travels around
  the body,into their lungs. Gas exchange takes
  place. Their gills are flaps that let air in from
  the water.

4
Amoeba have just one cell
We are all GLORIFIED AMOEBA!!!
                                    
                                 

• They have just one cell because they are very
  small.

5
Worms have wet skin

The earthworm absorbs oxygen and gives off carbon
dioxide through a thin skin. This skin is
protected by a thin cuticle secreted by the
epidermis and kept moist by a slimy mucus also
produced by epidermal cells. A moist surface is
necessary for oxygen to be absorbed and carbon
dioxide to be given off. If the worm is dried by
the sun, it will die because the exchange of
gases can no longer take place.
6
Insects have spiracles

• Insects breathe through the spirals, the air
  travels in through the spiracles.

7
The five features of gas exchange surfaces are.

• Large surface area
• Thin permable surface
• Moist exchange surface
• Good blood supply
• Permiable