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16 Cards in this Set
- Front
- Back
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two semi-independent parts:
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1. A network of lymphatic vessels
2. Lymphoid tissues and organsscattered throughout the body |
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Fluid balance
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Returns to the venous system the fluid lost from blood in the capillary beds
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Lymph
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interstitial fluid once it has entered lymphatic vessel
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Lymph may also contain
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proteins leaked from plasma and tissues,
•cell debris •pathogens (bacteria, viruses, etc.) •metastasizing cancer cells |
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Lacteals
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Specialized lymphatic capillaries in intestinal wall
Carry away fats |
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defense
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Lymphoid tissue includes lymphocytes & phagocytes, and participates in immunity
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Lymphatic vessels return
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lymph to the subclavianveins
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Lymph node
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occur at junctions of lymphatic vessels
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Lymph nodes contain lymphoid tissue:
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Filter the lymph
Initiate immune reactions to pathogens/cancer cells in lymph |
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Lymphocytes
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underlie adaptive (specific) immune responses
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B cells
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When activated, produce antibodies –the humoral immune response
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T cells
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When activated, some attack and destroy virus-infected or cancerous cells –the cell-mediated immune response
Others (helper T cells ) direct and stimulate both responses |
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Macrophages
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Differentiated monocytes–phagocytize foreign substances and help activate T cells
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Dendritic cells
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Spiny-looking cells with functions similar to macrophages
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Reticular cells
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Fibroblast–like cells that produce a fibrous support matrix for the other cells –i.e. loose connective tissue
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Lymphoid tissue types
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a. Diffuse
Scattered through every body organ b. Lymphoid follicles (nodules) Concentrations found in isolated clusters or as part of larger organs |
