Lymphatic vessels Lymphoid Tissue Spleen

Lymphatic vessels Lymphoid Tissue Spleen www.phwiki.com

Lymphatic vessels Lymphoid Tissue Spleen

Caldwell, Arsenio, On-Air Personality has reference to this Academic Journal, PHwiki organized this Journal CH 23: The Lymphatic System Goals Discuss the organization of the lymphatic system, including the vessels, principal lymph nodes, thymus, in addition to spleen Explain the relationship between the lymphatic in addition to circulatory systems, in addition to the role of lymphoid tissue structures in addition to lymphocytes in the body’s defense Accessory to cardiovascular system there are two drainage systems Overview of the Lymphatic System Includes, vessels, fluid, in addition to nodes or nonsecreting “gl in addition to s”. Lymphatic vessels convey fluid from the periphery to the veins. The fluid, lymph (=clear spring water), is what seeps out of the blood at the peripheral capillaries. Composition is similar to plasma without the proteins Lymphatic organs or tissues (“gl in addition to s”) are filtering areas in addition to arenas of lymphocyte maturation in addition to competency. Major Functions of Lymphatic System Filtration of lymph Return of seeped fluid to c.v. system “Education” in addition to production of immune system lymphocytes Transport of digested lipids from small intestinal lacteals

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Lymph Capillaries Thin walled endothelium (no BM) with periodic one way valves. In general they parallel veins. Closed ends allow fluid flow inward only Pick up in addition to recycle extra tissue fluid Lymph circulation due to Compare to Fig. 23.2 Location of Lymph Capillaries Everywhere, except as long as CNS in addition to bone marrow, as well as cornea in addition to cartilage. Special set of lymph capillaries in villi of small intestine = Lacteals Lymphatic vessels comparable in structure to veins Damaged valves or blocked lymph vessels

Lymph capillaries converge to become collecting vessels in addition to end up as either Thoracic duct or right lymphatic duct Thoracic (left lymphatic) duct Left subclavian vein Right lymphatic duct Right subclavian vein Cysterna Chyli Fig 23.4 largest Lymphocytes Agranulocytes – large nuclei in addition to small amount of cytoplasm Function in identification in addition to inactivation/destruction of pathogens Types of Lymphocytes T Cells – cellular immunity – specific as long as previously identified pathogens T Helper, T Killer, T Suppressor, in addition to memory cells B Cells – humoral immunity – plasma cells produce antibodies specific to the antigen or pathogen; memory cells NK cells – non-specific, provide immunological surveillance

Bone Marrow: Lymphopoiesis Lymphocytes are later also produced in thymus, spleen in addition to tonsils Fig 23.7 Lymphoid Tissue C.t. loaded with Lymphocytes Lymphoid nodules are unencapsulated clusters of lymphocytes ( ~ 1mm). Found beneath epithelial lining of respiratory, digestive & urinary tracts Mucosa associated lymphatic tissue (MALT) in GI tract 5 tonsils aggregate lymphoid nodules in small intestine (= Peyers patches) appendix – walls contain lymphoid tissue 1 2 2 = adenoids Lymph Nodes ~ 500 ( 1mm to 25 mm) Bean-shaped with hilus several afferent vessels, one efferent vessel Function Popular term “lymph gl in addition to ” is misnomer. Why Contain lots of lymphocytes & Macrophages Clinical application: Swollen lymph nodes Fig 23.9

Distribution of LNs Cervical lymph nodes – drain head in addition to neck Axillary lymph nodes – drain arms in addition to breasts Popliteal lymph nodes – drain legs, drain into Inguinal lymph nodes – drain lower limb Thoracic lymph nodes – drain thoracic viscera Abdominal lymph nodes – drain pelvic region Intestinal in addition to mesenteric lymph nodes – drain abdominal viscera Thymus Location above heart, posterior to sternum Divided into lobules Only lymphoid organ that does NOT fight antigens, it functions as “T-cell academy” Blood thymus barrier prevents premature stimulation of developing T-cells Involution after puberty Epithelial cells produce thymic hormones Spleen Largest lymphoid organ Soft in addition to very blood rich Red pulp sinusoids containing RBCs white pulp lymphoid tissue Major Functions: Initiation of Immune response to antigens in blood Removal of aged in addition to defective RBCs Repository as long as new RBCs Fe salvaging, storage in addition to recycling Fig 23-17 Surfaces named as long as contacts: diaphragmatic, visceral, gastric, renal

Caldwell, Arsenio WVAS-FM On-Air Personality www.phwiki.com

Caldwell, Arsenio On-Air Personality

Caldwell, Arsenio is from United States and they belong to WVAS-FM and they are from  Montgomery, United States got related to this Particular Journal. and Caldwell, Arsenio deal with the subjects like Jazz

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