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A disease-causing organism. Includes bacteria, viruses, fungi and parasites.
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Pathogen
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An organ system that defends the body against infection and disease; this system returns tissue fluid to the bloodstream.
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Lymphatic system
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Cell of lymphatic system providing defense against specific pathogens or toxins.
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Lymphocyte
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Lymphocyte response to provide a defense against specific threats to the body.
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Immune response
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Resistance to injuries and diseases caused by foreign compounds, toxins, or pathogens.
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Immunity
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A substance capable of inducing the production of antibodies.
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Antigen
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A globular protein produced by plasma cells that will bind to specific antigens and promote their destruction or removal from the body.
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Antibody
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Network of vessels that carries lymph.
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Lymphatic vessels
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A fluid similar to plasma, but with a lower concentration of proteins. All lymph is filtered through lymph nodes.
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Lymph
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Bone-marrow derived. differentiate into plasma cells. responsible for humoral or antibody-mediated immunity.
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B-cells
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Produce and secrete antibodies that react with specific chemical targets called antigens.
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Plasma cells
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Thymus dependent. attack foreign cells or body cells infected by viruses. responsible for cell-mediated immunity.
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T-cells
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Connective tissue dominated by lymphocytes.
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Lymphoid tissue
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Organized lymphoid tissue contained within a connective tissue capsule. distributed in areas of the body especially vulnerable to injury or invasion.
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Lymphoid organs
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Main function is to filter lymph, remove antigens within lymph and stimulate lymphocyte activity for antigen disposal.
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Lymph node
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