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Include microscopic, permeable, blind-ended capillaries, Lymphatic collecting vessels AND Trunks and ducts Lymphatic Vessels
Similar to blood capillaries, with modifications: Very permeable  Loosely joined endothelial minivalves Withstand interstitial pressure and remain open. Lymphatic Capillaries
specialized lymph capillaries present inintestinal mucosa Lacteals
drains the right upper armand the right side of the head and thorax Right lymphatic duct
arises from the cisterna chyli anddrains the rest of the body Thoracic duct
The lymphatic system lacks a pumping organ
Uses the same methods as veins to propel lymph: Contractions of smooth muscle in the walls of the lymphatics Lymph Transport
Manage the immune response Attack and destroy foreign cells. T cells
Produce plasma cells, which secrete antibodiesAntibodies immobilize antigens. B cells
phagocytize foreign substances andhelp activate T cells Macrophages
spiny-looking cells with functions similar to macrophages Dendritic cells
fibroblast–like cells that produce astroma, or network, that supports other cell types in lymphoid organs Reticular cells
Two basic functions:Filtration – macrophages destroy microorganisms and debrisImmune system activation – monitor for antigens and mount an attack against them Lymph Nodes
extended inward from the capsule anddivide the node into compartments Trabeculae
Nodes have two histologically distinct regions: a cortex and a medulla
Medullary cords extend from the cortex and contain B cells, T cells, and plasma cells
Throughout the node are lymph sinuses crisscrossed by reticular fibers
reside on reticular fibers and phagocytizeforeign matter Macrophages
afferent lymphatic vessels Lymph enters via
Largest lymphoid organ, Immune surveillance and response, Cleanses the blood Spleen
The Spleen: Site of fetal erythrocyte production
Which area of the Spleen: containing mostly lymphocytes suspended on reticular fibers and involved in immune functions White pulp
Which area of the Spleen: remaining splenic tissue concerned with disposing of worn-out RBCs and bloodbornepathogens RED PULP
A bilobed organ that secretes hormones (thymosinand thymopoietin) that cause T lymphocytes tobecome immunocompetent Thymus
contains fewer lymphocytes and thymic(Hassall’s) corpuscles (thymus) MEDULLA
contains densely packed lymphocytes andscattered macrophages (THYMUS) CORTEX
The THYMUS functions strictly in T lymphocyte maturation
The thymus does not directly fight antigens
The stroma of the thymus consists of star-shaped epithelial cells
isolated clusters of lymphoid tissue, similar to tonsils, Destroy bacteria, preventing them from breaching the intestinal wall Peyer’s patches
protects the digestive and respiratory systems from foreign matter MALT – mucosa associated lymphatic tissue
Generate “memory” lymphocytes for long-term immunity. Aggregates of lymphoid nodules located in the wall of the ileum. Peyer's patches
site of T cell maturation Thymus
This structure attached to the cecum is in an ideal place to destroy bacteria before it migrates into the large intestine appendix
What lymphatic structure absorbs excess tissue fluid? capillary
What lymphatic structure absorbs lipids in the intestine? lacteal
What lymphatic structure forms from the merging of the intestinal and lumbar trunks? cisterna chyli
What lymphatic structures trap bacteria in the posterior oral mucosa? palatine tonsils
Which sequence best describes the flow of lymph through the lymphatic system? Capillaries - vessels - trunks - ducts
It drains the lymph from the entire left side of the body and the right abdomen and leg Hint: drains its lymph at the junction of the left internal jugular and subclavian veins. thoracic duct
The lymphoid organs, located in the throat, that defend against invading bacteria coming in through the mouth and nose are tonsils
line the sinuses, they process foreign material passing through the sinuses. Macrophages
A bilobed organ that secrets hormones (thymosin and thymopoietin) that cause T lymphocytes to become immunocompetent Thymus
tonsils – either side of the posterior end of the oral cavity Palatine
tonsils that lie at the base of the tongue Lingual
tonsil at the posterior wall of the nasopharynx Pharyngeal
tonsils that surrounds the openings of the auditory tubes into the pharynx Tubal
____ _____ _____ lacks an organ that acts as a pump The lymphatic system
Antigen are anything the body perceives as foreign
Created by: ascpstudent100