OCR GCSE Combined Science B · J260

Organism Defences Against Pathogens

Describe the physical, chemical, and microbial defences that inherently protect humans from pathogen entry.
Explain the function of platelets in sealing wounds to prevent blood loss and pathogen entry.
Understand the critical role of the immune system in actively protecting the body against diseases.
Explain how white blood cells systematically destroy pathogens through ingestion, chemical release, or targeted antibody production.
Describe the role of memory cells in maintaining lasting immunity by rapidly producing antibodies upon re-infection.

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