Flashcards
Key area 4.2 Specific defences
Flashcards do conjunto (6)
- 1Specific defences Immune surveillanceA range of white blood cells which constantly circulate and monitor the tissue
If tissue is damaged cells release cytokines which increase blood flow resulting in specific white blood cells to accumulate at the site of infection - 2AntigenA molecule that can produce an immune response in the body
- 3Specific defences Clonal selection theoryLymphocytes have a single type of membrane receptor for one antigen. Antigen binding leads to repeated lymphocyte division resulting in a clonal population of lymphocytes
- 4Specific defences T lymphocytesA.K.A Helper T cells
These cells secrete cytokines which activate B lymphocytes and phagocytes. - 5Specific defences T lymphocytesA.K.A Cytotoxic T cell
This destroys infected cells by apoptosis - 6Specific defences B lymphocytesThe cytokines released by Helper T cells stimulate specific B cells to clone themselves. Each clone produces a specific antibody molecule that will recognise a specific antigen surface molecule and pathogen or toxin.