Human Defense Systems - Non-specific
Physical and chemical barriers, white blood cell responses, inflammatory response
What you'll cover
- First line of defense: skin, mucus, stomach acid
- Second line of defense: white blood cells
- Phagocytosis process by macrophages
- Inflammatory response and fever
- Chemical defenses: enzymes in tears, antibacterial substances
- Physical barriers: cilia, stomach acid pH
- White blood cell types and functions
- Links to blood components (Topic 12)
Study this topic
Your Body's Security System
Key Facts: Non-Specific Defences
First Line of Defence: Physical Barriers
First Line of Defence: Chemical Barriers
Physical vs Chemical Barriers
First Line Defence Mechanisms
Second Line of Defence: Phagocytosis
Phagocytosis Process
Why Physical and Chemical Barriers Are the First Priority
Key Definitions
Common Misconceptions
Memory Aids
Required Practical: Testing Antibacterial Substances
Exam Focus
Knowledge Organiser
Exam Tips: Non-Specific Human Defences
Sample Flashcards
Exam questions for Human Defense Systems - Non-specific
Which part of the body acts as the main physical barrier to prevent pathogens entering?
Explain how mucus and cilia in the airways protect against pathogens.
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