Phagocytosis

• What happens if a pathogen gets past the body's barriers?

  The immune system responds with white blood cells
• What are the two types of responses white blood cells have?

  Specific and nonspecific responses
• What type of white blood cells are phagocytes?

  They are nonspecific responders
• What is another name for phagocytes?

  Macrophages
• Where are phagocytes found in the body?

  In blood and tissues
• What triggers phagocytes to move towards pathogens?

  Chemicals or debris released by pathogens
• How do phagocytes recognize pathogens?

  Through receptors that bind to antigens
• What happens to a phagocyte when it binds to a pathogen?

  It changes shape to engulf the pathogen
• What is the vesicle called that contains the engulfed pathogen?

  Phagosome
• What fuses with the phagosome to destroy the pathogen?

  Lysosome
• What enzyme is released by lysosomes to destroy pathogens?

  Lysozyme
• What is the function of lysozyme?

  To hydrolyze and destroy pathogens
• What happens to the soluble products after a pathogen is destroyed?

  They are absorbed and recycled by phagocytes
• What does a phagocyte become after presenting an antigen?

  An antigen presenting cell
• How do phagocytes respond to different types of foreign particles?

  They respond the same regardless of the particle
• What is the mechanism by which pathogens are destroyed?

  Lysosomes fuse with phagosomes releasing enzymes