CIE IGCSE Biology: 复习笔记:9.1.16 White Blood Cells: Extended

CIE IGCSE Biology: 复习笔记:9.1.16 White Blood Cells: Extended

Lymphocytes & Phagocytes: Extended

  • White blood cells are part of the body’s immune system, defending against infection by pathogenic microorganisms
  • There are two main types, phagocytes and lymphocytes

Phagocytes

  • Carry out phagocytosis by engulfing and digesting pathogens

Phagocytosis, IGCSE & GCSE Biology revision notesPhagocytosis

  • Phagocytes have a sensitive cell surface membrane that can detect chemicals produced by pathogenic cells
  • Once they encounter the pathogenic cell, they will engulf it and release digestive enzymes to digest it
  • They can be easily recognised under the microscope by their multi-lobed nucleus and their granular cytoplasm

Lymphocytes

  • Produce antibodies to destroy pathogenic cells and antitoxins to neutralise toxins released by pathogens
  • They can easily be recognised under the microscope by their large round nucleus which takes up nearly the whole cell and their clear, non-granular cytoplasm

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