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

⭐️ https://www.cognito.org/ ⭐️

** 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 **
   • GCSE Maths (9-1)  

   • GCSE Biology (9-1)  

   • GCSE Chemistry (9-1)  

   • GCSE Physics (9-1)  

   • Alevel Biology  

#GCSE #Biology #study