Biology
T-lymphocytes include T helper cells and T killer cells. Both of these types of cell place their specific receptors in their cell surface membranes. On encountering the relevant antigen, they are activated and divide by mitosis to form a clone.
- # 63 Summary Of Immunity
1 Phagocytes and lymphocytes are the cells of the immune system. 2 The diagram shows how to recognise phagocytes and lymphocytes in microscope slides and photomicrographs of blood. 3 Phagocytes originate in the bone marrow and are produced there throughout...
- #59 The Immune Response - Lymphocytes
Lymphocytes, unlike phagocytes, act against specific pathogens. Each lymphocyte contains a set of genes that codes for the production of a particular type of receptor. We have many million different types, each producing just one type of receptor....
- # 58 The Immune System - Phagocytes
Credit: Pass My Exams.The human immune system is made up of the organs and tissues involved in destroying pathogens inside the body. There are 2 main groups of cells involved: ? phagocytes: ingest and digest pathogens or infected cells; ? lymphocytes: ...
- #57.2 Immunity - Syllabus 2016
11.1 The immune system 11.2 Antibodies and vaccination An understanding of the immune system shows how cells and molecules function together to protect the body against infectious diseases and how the body is protected from further...
- #57 Immunity - Syllabus 2015
? The immune system ? Vaccination Candidates should be able to: (a) [PA] recognise phagocytes and lymphocytes under the light microscope; (b) state the origin and describe the mode of action of phagocytes (macrophages and neutrophils); (c) describe...
Biology
# 61 Action of T-lymphocytes
Activated T helper cells secrete chemicals called cytokines. These stimulate B-lymphocytes to produce plasma cells, and stimulate monocytes and macrophages to attack and destroy pathogens.
Activated T killer (cytotoxic) cells attach to body cells that display the antigen matching their receptor. This happens when a body cell has been invaded by a virus. The T killer cell destroys the infected body cell.
Someof the clone of T cells become memory cells, which remain in the body and can react swiftly if the same pathogen invades again.
Animation
Cell-mediated immunity
Syllabus 2015 ? The immune system (c) describe the modes of action of T-lymphocytes; |
Syllabus 2016 11.1 The immune system b) describe the modes of action of T-lymphocytes |
- # 63 Summary Of Immunity
1 Phagocytes and lymphocytes are the cells of the immune system. 2 The diagram shows how to recognise phagocytes and lymphocytes in microscope slides and photomicrographs of blood. 3 Phagocytes originate in the bone marrow and are produced there throughout...
- #59 The Immune Response - Lymphocytes
Lymphocytes, unlike phagocytes, act against specific pathogens. Each lymphocyte contains a set of genes that codes for the production of a particular type of receptor. We have many million different types, each producing just one type of receptor....
- # 58 The Immune System - Phagocytes
Credit: Pass My Exams.The human immune system is made up of the organs and tissues involved in destroying pathogens inside the body. There are 2 main groups of cells involved: ? phagocytes: ingest and digest pathogens or infected cells; ? lymphocytes: ...
- #57.2 Immunity - Syllabus 2016
11.1 The immune system 11.2 Antibodies and vaccination An understanding of the immune system shows how cells and molecules function together to protect the body against infectious diseases and how the body is protected from further...
- #57 Immunity - Syllabus 2015
? The immune system ? Vaccination Candidates should be able to: (a) [PA] recognise phagocytes and lymphocytes under the light microscope; (b) state the origin and describe the mode of action of phagocytes (macrophages and neutrophils); (c) describe...