Immunology Flashcards
What are the 2 types of immunity
innate (non-specific)
adaptive (specific)
What are the components of innate immunity
-physical barriers (skin)
-mechanical factors (cough/ cilia)
-secretions (tears/ saliva)
-cellular factors (phagocytic/ NK cells)
What are the 2 types of acquired immunity
Cell mediated- T cells
Humoral -B cells/ antibodies
What is an antigen
Anything that brings about an immune response
and
anything that binds specifically to antibodies/ T-cell antigen recpetors.
What are the actions brought about by antibodies binding to antigens
-lysis of bacteria
-neutralization of toxins
-opsonization (mark antigen for other cells to come and destroy)
-antibody dependent cell mediated cytotoxicity
What cells produce antibodies
B cells that differentiate into plasma cells
Where are antibodies produced
lymph nodes
spleen
bone marrow
What are the 5 different classes of immunoglobulins
IgG
IgA
IgM
IgE
IgD
Which is the heaviest Ig/ has the most antibody binding sites
IgM
Which Ig is the most abundant in the plasma AND can cross the placenta
IgG
Which Ig are characteristic of the
primary immune response
secondary immune response
primary= IgM
secondary= IgG
Which Ig is responsible for protection of mucosal surfaces and how
IgA
production of secretions- tears, saliva, sweat, mucus
present in respiratory and GI tract
What are the functions of IgE
anaphylactic reactions
anti-parasitic
stimulates mast cells, basophils and recruits eosinophils
Which Ig cause complement activation
IgG IgM
Functions of IgD
help in B cell differentiation
acts as a lymphocytic membrane receptor
Functions of IgG
Neutralises toxins
opsonizes bacteria
characteristic of secondary immune response
Functions of IgM
opsonizes and agglutinates bacteria
characteristic of primary immune response
What cells are responsible for cell-mediated immunity
T cells
What are the different types of T-cells
CD4- T helper
CD8- cytotoxic T cells
CD25- activated cytotoxic T cells
What is the function of T-helper cells
present antigens and activates CD8, B cells and macrophages