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chpt 20

Lymphatic System Consists of three parts A network of lymphatic vessels (lymphatics) Lymph fluid Lymph nodes
What are the functions of lympathetic system Returns interstitial fluid and leaked plasma proteins back to the blood. Once interstitial fluid enters lymphatics, it is called lymph
Together with lymphoid organs and tissues, provide the structural basis of the immune system
lympathetic vessels are one way systems that lymph flows toward the heart only.
Lymph vessels (lymphatics) include Lymphatic capillaries Lymphatic collecting vessels Lymphatic trunks and ducts Collecting vessels > Trunks (J – BILS) > RT Lymph Duct & Thoracic Duct.
Similar to blood capillaries, except Very permeable (take up cell debris, pathogens, and cancer cells) Lymphatic Capillaries
Any increase in Interstitial pressure forces the valves open
Any increase in lymphatic pressure forces the valves closed
Lymphatic Capillaries are Are present in the CNS as of 2015
specialized lymph capillaries present in intestinal mucosa Absorb digested fat and deliver fatty lymph (chyle) to the blood Lacteals
Similar to veins, have 3 tunics, except Have thinner walls. More internal valves Anastomose more frequently Lymphatic Collecting Vessels
Collecting vessels in the skin travel with superficial veins
Deep vessels travel with arteries
Nutrients are supplied from branching vasa vasorum
Formed by the union of the largest collecting ducts Collecting….Trunks…..Ducts
drains the right upper arm and the right side of the head and thorax Right lymphatic duct
arises from the cisterna chyli and drains the rest of the body Thoracic duct
Each empties lymph into venous circulation at the junction of the internal jugular and subclavian veins
Lymph is propelled by Pulsations of nearby arteries Contractions of smooth muscle in the walls of the lymphatics
Lymph vessels are low pressure
Return excess fluid & protein to bloodstream Lymph
Carry absorbed fats from intestine to bloodstream Lymph
the main warriors of the immune system Lymphocytes
Manage the immune response Attack & destroy invaders. T cells (T lymphocytes
Produce plasma cells that make antibodies. Antibodies mark antigens. Both are immunocompetent. B cells (B lymphocytes)
Created by: jennysevere24



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