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Lymphatic System

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Elena Zhan

on 10 December 2012

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Transcript of Lymphatic System

Thank-you <3 by: Elena Zhan and Ahsan Shahid Main Functions The Lymphatic System Maintains fluid balance
returns interstitial fluid (blood plasma that has escaped from the bloodstream) back into the blood Lymph Nodes small, enclosed, bean-shaped masses of lymphatic tissue found throughout the body along lymphatic vessels
acts as a filter for lymph, preventing the spread of microorganisms and toxins
destroys foreign materials
produce antibodies
contain lymphocytes, T cells and B cells
Spleen largest lymphatic organ (12 cm in length)
filters cellular debris, aged blood cells, bacteria and other pathogens from the blood
destroys old RBC and recycles recycles their parts
removes iron from other components of the hemoglobin and binds it to storage protein
produces and stores blood cells
FYI: 1/3 of blood platelets are stored here
T cells and B cells multiply quickly in the white pulp:
T cells then enter blood to attack foreign cells
B cells produce plasma cells and antibodies
can be removed as the liver and lymph nodes are able to carry out its function Thymus promotes the maturation of T lymphocytes
immature T cells travel from the bone marrow to the thymus through the bloodstream
T cells gather in the cortex and continue their development
once matured, T cells leave the thymus through either blood vessels or lymphatic vessels and spread to other lymphatic tissues
most of the lymphocytes produced here die without leaving the organ Tonsils small masses of lymphatic tissue that humans can live without
produces antibodies that help kill intruders
easily infected or inflamed by materials caught in the pits on the exposed surface of the tonsils Defends the body against infections
produces lymphocytes (type of WBC) that help to get rid of disease-causing microorganisms white pulp is made up of reticular fibers and lymphocyte
red pulp consists of vessels filled with blood
made up of two lobes
grows during childhood to a max of 40g at puberty then slowly decreases to about 6g Bone Marrow produces B cells, natural killer cells, granulocytes, RBC, platelets and immature T cells
the T cells migrate to the thymus And now,
a short video
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