Immune system Ch 15 Flashcards
Immune system
Functions to protect the body from harmful substances and utilizes other systems to maintain its functions
Immunity
exemption (implies exempt from or protected from foreign substances)
Immun/o
Protected
Immunology
The study of the immune system
Lymphocyte
A type of white blood cell that is involved in the immune response and works against specific antigens
T Lymphocyte
A type of lymphocyte (white blood cell) that are responsible for cell mediated immunity
B Lymphocyte
A type of lymphocyte (white blood cell) that are responsible for humoral immunity. In the presense of a specific antigen, they diferenciate into plasma and memory B cells
Memory B cells
Type of B lymphocyte that remember a specific antigen and stimulate a faster and more intense response when the same antigen is presented in the body
Plasma Cell or plasmocytes
An immune cell that produces and secretes a specific antibody for a specific antigen
Immunoglobulins (Ig)
Antibodies made by plasma cells. There are five distinct immunoglobulins.
IgA
A type of immunoglobulin found in the mucous membrane lining of the intestines and the bronchi, and secretions such as saliva, sweat and tears; protects those areas by preventing attachment of bacteria and viruses to the epithelial surfaces that line most organs
IgD
A type of immunoglobulin found large amounts on the surface of B cells; unknown function but is important in B cell activation
IgE
A type of immunoglobulin found bound to mast cells in lungs, skin, and cells of the mucous membranes; provides defense against the environment and is involved in allergic reactions
IgG
A type of immunoglobulin found in blood stream, interstitial fluid (tissue), and lymph (lymph vessels); synthesized in response to invading germs such as bacteria, fungi, and viruses; most abundant antibody and only class that can cross the placenta; found in high concentrations in colostrum of lg domestic species (horse, cattle, pigs)
IgM
A type of immunoglobulin found in circulating fluid(due to its size it cannot exit the blood stream); first immunoglobulin produced in response to an initial exposure to an antigen; invades and provides protection in the earliest stages of infection.
T lymphocytes
Small circulating lymphocytes produced in the bone marrow and mature in the thymus, hence the name T cells. Their function is to coordinate immune defenses and kill organisms on contact
Cell-mediated Immunity (not book vocab)
Involves T cell activation and cellular secretions.It doesn’t involve antibody production but the antibodies produced during humoral immunity may play a role in some cell-mediated responses.
Helper T cells (also known as CD4 cells)
T lymphocytes that secrete substances, such as cytokines, that stimulate the production of B lymphocytes and cytotoxic T cells.
Cytotoxic T cells (also known as CD8 cells)
T lymphocytes that destroy intracellular pathogens
Suppressor T cells
T lymphocytes that stop B and T lymphocyte activity when this activity is no longer needed
Memory T cells
remember a specific antigen and stimulate a faster and more intense response when that same antigen is presented to the body
Monocytes
A leukocyte formed in bone marrow and transported to other parts of the body. They migrate to tissues such as the spleen to become macrophages.
Macrophage
Phagocytic cell that protects the body by engulfing invading cells and by interacting with other cells of the immune system.
Histiocytes
Large macrophages found in loose connective tissue
