THE IMMUNE SYSTEM

• immune cells are white blood cells that fight off infection, disease, or other abnormalities within the body
• lymphocytes are white blood cells that produce antibodies to attack antigens
• the immune system is the body's defense against foreign invaders
• protects the body from outside invaders

  immune system
• also known as white blood cells, are a vital component of the immune system responsible for defending the body against infections and foreign invaders.

  leukocytes
• a gland between the lungs and just below the neck

  thymus
• an organ that filters the blood. it sits in the upper left abdomen

  spleen
• found in the center of the bones, also produces red blood cells

  bone marrow
• small glands positioned throughout the body, linked by lymphatic vessels

  lymph nodes
• surround and absorb pathogens and break them down

  phagocytes
• most common type of phagocyte and tend to attack the bacteria

  neutrophils
• largest type and have several roles

  monocytes
• patrol for pathogens and also remove dead/dying cells 


  macrophages
• have many jobs, including helping to heal wounds and defend against pathogens

  mast cells
• • helps the body remember previous invaders and recognize them if they come back to attack again
  • begin in bone marrow (some stay in the marrow)

  lymphocytes
• produce antibodies and help alert the T lymphocytes

  B lymphocytes
• destroy compromised cells in the body and help alert other leukocytes

  T lymphocytes