GCSE Biology - Immune System & Defences | Types of White Blood Cell

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*** WHAT'S COVERED ***
1. The Human Body's Defence System Overview
* Distinction between physical/chemical barriers and the immune system.
2. Physical & Chemical Barriers Against Pathogens
* Role of the skin (physical barrier, secretions).
* Defences in the nose and airways (hairs, mucus, cilia).
* Role of stomach acid (hydrochloric acid) in killing pathogens.
3. The Immune System and White Blood Cells
* How the immune system responds when pathogens enter the body.
* The role of white blood cells in patrolling the body.
4. Key Functions of White Blood Cells
* Phagocytosis: engulfing and destroying pathogens.
* Antitoxin production: neutralising toxins produced by pathogens.
* Antibody production: targeting specific pathogens.
5. Antigens and Antibodies
* Definition of antigens as foreign substances.
* Definition of antibodies as specific proteins produced by white blood cells.
* How antibody specificity and immune memory lead to immunity.

*** CHAPTERS ***
0:00 Intro to Body's Defence System
0:13 Barriers vs Immune System
0:28 Physical & Chemical Barriers: Skin
0:49 Physical & Chemical Barriers: Nose, Mouth & Airways
1:41 Physical & Chemical Barriers: Stomach Acid
2:06 The Immune System: Introduction
2:16 White Blood Cells
2:27 Function 1: Phagocytosis
2:49 Function 2: Producing Antitoxins
3:12 Function 3: Producing Antibodies
3:55 Antibody Specificity & Immune Memory

*** PLAYLISTS ***










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