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Immune System

Vocab for a Immune System Unit


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Bone marrow
the fatty network of connective tissue that fills the cavities of bones, loose connective tissue, yellow bone marrow is full of fat cells, red bone marrow mixture of mature and immature red and white blood cells and the stem cells that produce them. Yellow is energy reserve, red important site of blood cell formation
Lymph Node
Organ located along a lymph vessel. These filter lymph and help attack viruses and bacteria.
(microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission
any substance (as a toxin or enzyme) that stimulates the production of antibodies
a type of granular leukocyte that functions in the ingestion of bacteria
immunological disorder in which some part of the body's immune system is inadequate and resistance to infectious diseases is reduced
an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection
T cells belong to a group of white blood cells known as lymphocytes, and play a central role in cell-mediated immunity. They can be distinguished from other lymphocyte types, such as B cells and natural killer cells by the presence of a special receptor on their cell surface called the T cell receptor (TCR). The abbreviation T, in T cell, stands for thymus, since it is the principal organ in the T cell's development.
White blood cell with numerous dark-staining granules: eosinophil, neutrophil, and basophil.
A phagocytic cell present in many tissues that functions in innate immunity by destroying microbes and in acquired immunity as an antigen-presenting cell.
a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity
any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response
Immune response
a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen
(virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts
immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies
B cells are lymphocytes that play a large role in the humoral immune response (as opposed to the cell-mediated immune response, which is governed by T cells). The principal functions of B cells are to make antibodies against antigens, perform the role of Antigen Presenting Cells (APCs) and eventually develop into memory B cells after activation by antigen interaction. B cells are an essential component of the adaptive immune system.
The body's largest lymphatic organ which consists of two compartments. One is filled with red pulp (full of RBC that can be released if necessary) and one with white pulp (full of lymphocytes and macrophages)
Immune system
a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response
clear, colorless fluid, similar to blood plasma but low in protein. It originates as fluid that has been taken up by th lymphatic vessels. Contains a large number of lymphocytes

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