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B3.2 Transport
Theme - Form and function & Level 3 - Organisms This topic explores the topic of transport in organisms. It includes the adaptations and function of blood vessels (arteries, veins and capillaries) in...
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B3.3 Muscles & motility HL
Theme - Form & function Level 3 _ organisms This HL only topic explores the mechanisms and reasons for movement. It includes details about the sliding filament model of muscle contraction and the role...
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C3.1 Integration of body systems
Theme - Theme C - Interaction and interdependence This topic explores the integration of information by the brain, nervous system and endocrine system in humans as well as the role of auxin in the trophic...
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C3.2 Defence against disease
Theme C - Interaction and interdependence Level - Organisms This topic explores the way in which body systems recognise pathogens and fight to prevent infection. It looks at specific examples of HIV...
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D3.1 Reproduction
Theme D - Continuity and change, Level 3 _ OrganismsGuide time: SL: 5 hours AHL: 3 hours This topic explores the differences between asexual reproduction and sexual reproduction. The details of the...
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D3.2 Inheritance
Theme D - Continuity and change Level 3 - Organisms This topic explores the inheritance of alleles by offspring and the ways that they affect the traits, or characteristics, of the offspring. Terminology...
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A3.2 Classification
Theme A - Unity and diversity & Level 3 - Organisms This topic explores the way that cladistics has changed our view of classification. Using DNA base sequences and the sequences of amino acids in proteins...
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A3.1 Diversity of organisms
Theme A - Unity and diversity & Level 3 - Organisms This topic explores the concept of species and genomes. There is discussion of biological species concepts and the morphological species concept. Karyograms...
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D3.3 Homeostasis
Theme D - Continuity and change. Level 3 - Organisms Homeostasis is the maintenance of a constant internal environment of an organism. This is controlled by negative feedback loops. In this series of...
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D2.1 Cell & nuclear division
Theme D - Continuity and change & Level 2 - Cells This topic explores mitosis, meiosis and the events common to both which govern cell division in plant and animal cells. In the HL section the connection...