Gas exchange in Annelids
- Created by: Emily Cartwright
- Created on: 27-05-14 17:43
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- Gas Exchange in Annelids
- Elongated body shape increases SA:Vol ratio
- Live in damp areas and secrete mucus to ensure their skin remains moist
- A well developed capillary network close to the surface area of the skin provides a short diffusion pathway
- Their blood contains haemoglobin which has a high affinity for oxygen which increases the efficiency of gas exchange
- Earth worms have a low metabolic rate as they are slow moving, so their demand for oxygen is low
- Flatworms
- Aquatic animals which have evolved a flattened shape
- Have adapted to gas exchange in the following ways;
- Increased surface area:volume ratio by having flattened bodies
- Short diffusion pathway (body is only 0.2mm thick)
- Low demand for gas exchange due to their sedentary lifestyle
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