GCSE Biology - Immune System (Defences Against Pathogens) #38

The video explains the human body's defense system against pathogens, highlighting the physical and chemical barriers like skin, mucus, and stomach acid that prevent pathogen entry. It also covers the immune system's role, focusing on white blood cells and their functions, including phagocytosis, antitoxin production, and antibody creation. The video clarifies the difference between antigens and antibodies and describes how the immune system remembers pathogens to provide immunity.

What are the two main types of barriers in the human body's defence system?

How does the skin contribute to the body's defence against pathogens?

What role do white blood cells play in the immune system?

Explain the process of phagocytosis as it relates to the immune response.

What is the difference between antibodies and antigens?