immunology

• The definition of an antigen and an antibody:

  • Antigen: A toxin or other foreign substance that induces an immune response in the body, especially the production of antibodies
  • Antibody: A blood protein produced in response to and counteracting a specific antigen. Antibodies chemically combine with substances recognized as alien by the body, such as bacteria, viruses, and foreign substances in the blood
• The link between antigens and the initiation of the body’s response to invasion by a foreign substance
• The stages and cells involved in the body’s response to an antigen:

  • T cells
  • B cells
• The differences between cell-mediated immunity and antibody-mediated immunity
• The role of T and B memory cells in the secondary immune response