Ch. 20 Powerpoint to post-1

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21 Terms

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Lymphatic System
A system returning interstitial fluid and leaked plasma proteins back to blood consisting of lymphatic vessels, lymph, and lymph nodes.
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Lymph
Fluid found in lymphatic vessels, originating from interstitial fluid.
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Lymph Nodes
Organs that filter lymph and are involved in immune system activation.
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Lymphatic Vessels
A network of capillaries and larger vessels that transport lymph.
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Macrophages
Cells that phagocytize foreign substances and help activate T cells.
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T Cells
Type of lymphocyte that manages the immune response and can destroy infected cells.
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B Cells
Cells that produce plasma cells which secrete antibodies to mark antigens for destruction.
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Lymphedema
Severe localized edema caused by the prevention of normal lymph return to the blood.
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Thymus
Lymphoid organ where T cells mature; it is most active during childhood.
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MALT (Mucosa-Associated Lymphoid Tissue)
Lymphoid tissues found in mucous membranes which protect against pathogens.
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Peyer’s Patches
Clusters of lymphoid follicles in the small intestine that aid in immune surveillance by destroying bacteria.
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spleen
Largest lymphoid organ that cleanses blood, filters aged blood cells, and serves as a site for immune response.
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Lymphangitis
Condition in which lymphatic vessels appear as painful red lines under the skin.
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Lymphatic Capillaries
Blind-ended vessels that are highly permeable and responsible for absorbing lymph.
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Reticular Cells
Supporting cells in lymphoid organs that produce reticular fibers known as stroma.
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Antigens
Foreign substances that provoke an immune response, such as bacteria and viruses.
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Regulatory T Cells
Type of T cell that helps prevent autoimmunity.
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Cortex of Lymph Node
Outer region of a lymph node containing follicles with germinal centers rich in dividing B cells.
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Medulla of Lymph Node
Inner region of a lymph node that contains medullary cords and sinuses.
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Buboes
Swollen, inflamed lymph nodes that can appear during infections.
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Interstitium
Spaces between tissue cells where interstitial fluid circulates before entering lymphatic vessels.