IB Biology C3.2 Notes

This page contains our IB Biology notes for C3.2. By reading each one of these notes, you will fully cover the content for IB Biology 'Defence against infectious disease'.

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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The Immune system

Whilst you will learn about normal body function and how it fails during conditions, it is also important to understand how the body handles infectious disease. Organisms or viruses that cause infectious disease are called pathogens. The is the job of the immune system is to prevent pathogens from causing a disease, which is divided into:

Primary defense system – structures that aim to prevent pathogen entry.
Secondary defense system – structures that aim to destroy pathogens that have bypassed the primary defense system.

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