IB Biology D3.3 Notes

This page contains our IB Biology notes for D3.3. By reading each one of these notes, you will fully cover the content for IB Biology 'Further homeostasis'.

All Topic 3 Sub-topics

A3.1: Diversity Of Organisms

(HL)A3.1: Further diversity

(HL)A3.2: Classification & cladistics

B3.1: Gas Exchanges

(HL)B3.1: Further gas exchange

B3.2: Transport

(HL)B3.2: Further transport

(HL)B3.3: Muscle & motility

C3.1: Body Systems

(HL)C3.1: Plant systems

C3.2: Defence Against Infectious Disease

D3.1: Reproduction

(HL)D3.1: Further reproduction

D3.2: Monogenic Inheritance

(HL)D3.2: Polygenic inheritance

D3.3: Homeostasis

(HL)D3.3: 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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