IB Biology Sub-topic D3.3 Notes
This page contains our IB Biology notes for sub-topic D3.3. By reading each one of these notes, you will fully cover the content for IB Biology 'Further homeostasis'.
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Osmoregulation
In the HL syllabus, you need to also know about homeostasis in the context of water and solute concentration, called osmoregulation. Organisms can be classified into two groups based on their level of osmoregulation: osmoregulator or osmoconformer.
- Osmoregulators are organisms that conduct osmoregulation because their solute concentration is different than that of their surroundings. This generally occurs in terrestrial animals and freshwater fish.
- Osmoconformers are organisms that do not conduct osmoregulation because their solute concentration is identical to that of their surroundings. This generally occurs in saltwater organisms.
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