Summary Ch 5 Cell recognition and the immune system notes A* AQA A Level Biology
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Course
Unit 2 - Cells
Institution
AQA
Book
AQA Biology A Level Year 2 Student Book
A set of thorough and concise notes created and used by an A* grade student to revise cell recognition and the immune system (ch 5 from the A Level AQA Biology course). The notes are detailed and clearly explain the topic by breaking each process down into steps. It includes clear and detailed diag...
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5.1 Defence
mechanisms
,Defence mechanisms
• A range of layers of defence against pathogens
• Some are general and immediate e.g. skin, or phagocytosis
• Some are specific and slower but longer lasting e.g. cell mediated
response (T lymphocytes) and humoral response (B lymphocytes)
,Recognising our own cells
• All cells have specific molecules on their surface which have specifi
structures
• Proteins (antigens) most important as they have highly specific
tertiary structures
• These allow immune system cells to identify…
• Pathogens
• Non-self e.g. transplant tissue
• Toxins
• Abnormal body cells e.g. cancer
,
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