Lymphatic System and Immunity
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| Lymphatic System | =Lymph
=Lymphatic vessels
=Lymphatic tissue
=Lymphatic nodules
=Lymph nodes
=Tonsils
=Spleen
=Thymus
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| Lymphatic Vessels | --Carry lymph away from tissues
-Lymphatic capillaries
*More permeable than blood capillaries
*Epithelium functions as series of one-way valves
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| Functions of the Lymphatic System | Fluid balance
Excess interstitial fluid enters lymphatic capillaries + becomes lymph
Fat abs.
Abs, of fat + other substances frm digestive tract
Defense
Microorganisms + other foreign substances are filtered from lymph by lymph nod + frm blood by spl
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| Lymphatic Vessels | Carry lymph away from tissues
-Lymphatic capillaries=
*More permeable than blood capillaries
*Epithelium functions as series of one-way valves
Lymphatic capillaries join to form Lymphatic vessels
*Have valves that ensure one-way flow
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| Lymphatic Vessels II | Lymph nodes: Distributed along vessels and filter lymph
Lymphatic trunks: Jugular, subclavian, bronchomediastinal, intestinal, lumbar
Lymphatic ducts: Right and thoracic which connect to large veins
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| Lymphatic Tissue and Nodules | -Lymphatic tissue
*Consists mainly of lymphocytes
*Encapsulated or not
-Lymphatic nodules
*Numerous in loose connective tissue of digestive (Peyer’s patches), respiratory, urinary, reproductive systems
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| Tonsils | -Large groups of lymphatic nodules in nasopharynx and oral cavity
-Provide protection against bacteria and other harmful material
Groups
*Palatine
*Pharyngeal
*Lingual
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| Lymph Nodes | Organized in cortex and medulla
Substances removed by phagocytosis or stimulate lymphocytes or both
Only structures to filter lymph
**Afferent and efferent vessels
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| Spleen | -Can be ruptured in traumatic abdominal injuries resulting in bleeding, shock, death
-Blood flows through at 3 different rates
Fast (most), slow, intermediate
-Functions:
Destroys defective RBCs
Detects + responds 2 foreign subst
-reservoir for bld
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| Thymus | -Located in superior mediastinum
-Divisions: Cortex and medulla
-Site of maturation of T cells
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