Immune system

• Phagoctye:

  • Phagocyte has lobed nucleus and vesicles containing digestive enzymes.
  • Phagocytosis: engulf pathogen, vesicles fuse with vacuole, enzymes digest bacteria.
  • Antigen: protein/ carbohydrate on surface of pathogen which provokes immune system
• Lymphocyte:

  • Lymphocytes are found in blood and in lymph nodes
  • Large nucleus and they produce antibodies,
  • Antibodies: Y-shaped protein, bind to label pathogens.
  • Then either destroyed by being ingested by phagocytes, or the antibodies may do it.