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MICROBIOLOGY – ALCAMO
LECTURE:
Immune System, Lymph Node
Introduction
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The Lymphatic System
• The _______________________ defends the body from foreign invasion by disease causing agents such as viruses, bacteria, or fungi.
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The Lymphatic System
• Part of the immune system made of a network of __________________that carry a clear fluid called _________ in one direction - _____________________
• Also includes structures dedicated to the circulation and production of lymphocytes (_________, _________, _____________, __________________, _________, etc)
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The Lymphatic System• Blood does not directly come in
_________ with the cells and tissues in the body
• Parts of the blood first exit the blood vessels to become _________________, which comes into contact with the cells of the body.
• _________ is formed when interstitial fluid enters the initial _______________
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The Lymphatic System
• _________ and _________ interstitial fluid, including plasma protein to the blood, and thus helps maintain fluid balance
• _________ the body against disease by producing lymphocytes
• _________ lipids from the intestine and transport them to the blood
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Lymph Node
• __________________________________distributed widely throughout the body including the armpit and stomach/gut and linked by lymphatic vessels
• __________________ are found all through the body, and act as _________ or traps for foreign particles
• They are important in the proper functioning of the __________________
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Lymph Node StructureA. Pericapsular Connective Tissue and Fat
Tissue which clings to outside of node, holds
node _________, _________it, ready supply of
_________ for energy
B. Capsule• Dense outer covering which ________________
• ________________ – inner branches of capsule
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C. The Substance of the lymph node is divided into:
• __________________
• __________________
D. Germinal Centers
• Dense, darkly stained round areas just inside the capsule where certain
___________________________
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Vessels
• Multiple _________ lymph vessels bring _________ into the _________________
• The _________ gets slowly _________ through the substance of the lymph node where it encounters ___________
• The _________ lymph vessel carries the lymph ____________________________
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VesselsA. Artery
– __________________________________from heart to node
– Has a _______________ and quite small inside diameter
– May contain visible _________________
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VesselsB. Vein
– Carries __________________from node to heart
– Has a __________________and larger inside diameter than the artery
– May contain visible blood cells
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Vessels
C. Lymph– Has almost _________
_________– Has a very large
inside _________
– Never contains _________ blood cells
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Maintain the pressure and volume of extracellular fluid by returning excess water and dissolved substances from the interstitial fluid to the circulation
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