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
Sample Questions
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.
19
exam-style questions
22
revision flashcards
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