Adaption for gas exchange
- Created by: katie
- Created on: 23-03-13 14:26
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- Adaption for gas exchange
- Large surface area e.g. lungs
- Moist surface for diffusion e.g. gills
- Short diffusion pathway e.g thin walls
- Circulatory system with blood pigments/ haemoglobin
- External lungs minimise loss of water/heat
- Vascular movements e.g. lungs, insect abdominal movement
- Ensures fresh oxygen is brought to / carbon dioxide removed from gas exchange surface/ maintain concentration gradients.
- Frogs
- Inactive (frog) amphibian uses its moist skin for gas exchange
- Active (frog) amphibian uses lungs
- Tadpole stage uses gills
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Reptiles and birds
- More efficient lungs than amphibians
- Air sacs act as bellows
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Insects
- Have a branched chitin lined system / presence of tracheae
- With openings called spiracles
- Gases exchange directly with tissues/No blood pigment/ haemoglobin present
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