Chapter_20__Part_I__-_Lymphatic_System

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21 Terms

1
Lymphatic System
The system in the body that drains excess fluid, discards unwanted substances, and aids in immune function.
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2
Lymph
Fluid that is collected from tissues by lymphatic vessels, composed of water, proteins, fats, leukocytes, and waste.
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3
Lymphatic Vessels
Vessels that transport lymph away from tissues, similar in structure to blood vessels but designed to allow fluid and larger molecules to enter.
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4
Afferent Lymphatic Vessels
Lymphatic vessels that carry lymph from tissues to the lymph nodes.
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5
Efferent Lymphatic Vessels
Lymphatic vessels that carry lymph away from the lymph nodes towards the bloodstream.
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6
Lymph Nodes
Small, bean-shaped structures that filter lymph and house immune cells, acting as checkpoints in the lymphatic system.
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7
Lacteals
Lymphatic vessels located in the small intestine that absorb dietary fats.
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8
Mucosa-Associated Lymphatic Tissue (MALT)
Tissue that includes lymphoid follicles found in mucosal membranes, protecting against pathogens.
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9
Spleen
The largest lymphoid organ that filters blood, removes old erythrocytes, and houses white blood cells.
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10
Thymus
A lymphoid organ where T-cells mature and undergo selection processes before entering circulation.
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11
Lymphedema
Swelling due to excess interstitial fluid that occurs when lymphatic flow is obstructed.
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12
Tonsils
Clusters of lymphoid tissue located in the oral and nasal cavities, acting as the first line of defense against inhaled pathogens.
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13
Peyer’s Patches
Clusters of lymphoid tissue located in the ileum of the small intestine that help protect against pathogens.
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14
Reticular Tissue
A type of connective tissue characterized by a network of thin fibers, predominant in lymphoid organs.
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15
Leukocytes
White blood cells that play key roles in immune responses, including lymphocytes, dendritic cells, and macrophages.
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16
Positive Selection (T-cells)
A process in T-cell maturation ensuring that T-cells recognize MHC complexes properly.
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17
Negative Selection (T-cells)
A process in T-cell maturation ensuring that T-cells do not recognize self-antigens as foreign.
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18
Interstitial Fluid
Fluid that occupies the space between cells and is involved in the lymphatic system's fluid regulation.
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19
Cisterna Chyli
A collection of lymph from the intestinal trunk and lumbar trunks, which drains into the thoracic duct.
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20
Thoracic Duct
The largest lymphatic duct that drains lymph from the left side of the body and below the diaphragm into the bloodstream.
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21
Right Lymphatic Duct
Lymphatic duct draining lymph from the right upper side of the body back into the bloodstream.
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