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Lymphatic system
Unit 3
11
Anatomy
Undergraduate 2
11/05/2012

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Term
What is the function of the lymph system?
Definition
The lymph system retrieves excess tissue fluid (plasma that leaks out of the blood vessels) and filters it and cleans it and returns it to the blood
Term
What are the four characteristics of lymphatics?
Definition
Their wall contains three layers, just like blood vessels.
Lymph capillaries are highly permeable.
They contain valves.
Connecting vessels are NOT easily identified in dissection.
Term
Lymph capillaries differ from blood capillaries in what three ways?
Definition
They are different in that they are blind ended, more permeable, carry lymph instead of blood.
Term
Lymph capillaries are similar to blood capillaries in what way?
Definition
They are similar in that their walls consist of endothelial cells
Term
What are the five giant lymph nodes?
Definition
1. TONSILS and ADENOIDS
2. THYMUS
3. PAYER’S PATCHES
4. APPENDIX
5. SPLEEN
Term
What is the disease which is cancer of the lymph nodes?
Definition
Hodgkin’s Disease
Term
Do the lymph nodes feel tender in this disease?
Definition
No
Term
Which disease involves the Epstein-Barr virus attacking B-lymphocytes; characterized by inflammation of lymph vessels (lymphangitis)?
Definition
Mononucleosis
Term
What condition is the accumulation of fluid in connective tissue?
Definition
Edema
Term
What is a bubo?
Definition
It is not just an enlarged lymph node.
It is an infected lymph node that contains a large number of pathogens that are trapped in the node but not destroyed.
It is not cancer.
Term
What three mechanisms help move lymph through the lymphatic vessels?
Definition
1)Body movements during exercise.
2)Contraction of skeletal muscles.
3)Contractions of smooth muscle in the wall of the lymph vessels.
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