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Summary Biology Notes: Defence System and DNA

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2023/2024 Written for academic year
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11th Grade
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Biology
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This set of notes contains two pages, which concisely covers the following at a Year 11 standard: - Immune System - Barriers to Infection - DNA Structure - Chargaffs Rule - Complimentary Base Pairing

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Stage 1 Biology Defence System and DNA L Notes
Topic One: Defence (immune) system
Barriers to Infection

First Line of Defence
- Physical and chemical barriers which prevent pathogens entering the body
1. Skin
2. Mucous Membranes
3. Secretions
4. Acid

Second line of Defence
- The bodies innate non-specific immune response
1. Phagocytes
• Types of white blood cells
2. Inflammation
• Damage to a tissue by a physical injury triggers a localised inflammatory response

• Effect of Inflammatory Response:
The tissues go red and warm due to large amount of blood reaching the site

Third Line of Defence
- Acquired specific immune responses.

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1
Uploaded on
January 25, 2024
Number of pages
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Written in
2023/2024
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Summary
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Subjects

  • barriers to infection
  • dna structure
  • deoxyribonucleic acid
  • chargaffs rule
  • double helix
  • complimentary base pairing

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