T lymphocytes and Cell-mediated Immunity

• What is immunity?


  The ability of organisms to resist infection by protecting against disease-causing microorganisms or their toxins.
• What is an antigen?


  Any part of an organism or substance that is regonised as non-self by the immune system and stimulates an immune response.
• What biological molecule are antigens?

  Proteins.
• What does the presence of an antigen trigger?


  The production of an antibody.
• Where are antigens on a cell?

  On the cell-surface membrane or cell wall.
• What is a specific response?

  A slower response that provides long-term immunity.
• What does a specific immune response depend on?

  Lymphocytes.
• What are lymphocytes produced by?

  Stem cells in the bone marrow.
• Where do B lymphocytes mature?

  In the bone marrow.
• What are Blymphocytes associated with?

  Humoral immunity.
• What is humoral immunity?

  Immunity involving antibodies present in body fluids 'humour'.
• Where to T lymphocytes mature?

  In the thymus gland.
• What are T lymphocytes assocciated with?

  Cell-mediated immunity.
• What is cell-mediated immunity?


  Immunity involving body cells.