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16 Cards in this Set

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