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38 Cards in this Set
- Front
- Back
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Name 3 functions of the Lymphatic system
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Transport fat
Picks up leaked fluid Cleans the fluid |
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Describe the structure of the Lymphatic capillaries
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Pressure valve
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How is lymph moved through the lymph vessels?
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Muscle Contraction
1 way valves |
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What is MALT?
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Mucosa associated lymphatic tissue
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What is Lymph?
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Lymph is the fluid inside lymphatic vessels
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Where does Lymph come from?
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It enters lymphatic vessels from interstitial fluid. Interstitial fluid, in turn, is a filtrate of blood plasma.
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Name 2 lymphatic ducts & indicate the body regions usually drained by each
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The RIGHT lymphatic duct receives lymph from the right upper limp, the right side of the head and thorax.
The THORACIC duct drains lymph from the rest of the body. |
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What is the driving force for Lymph movement?
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Lymph movement is driven by the contraction of adjacent skeletal muscles, pressure changes in the thorax during breathing and the pulsations of nearby arteries.
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Which part of the body is lymph absent from?
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Bones, teeth, bone marrow & CNS
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What does lymphatics in the skin travel with?
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Superficial veins
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What do deep lymphatics travel with?
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Deep arteries
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What is the Lymphatic system made up of?
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Lymph duct
Lymph trunk Lymph node Lymphatic collecting vessels, WITH valves |
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What do Lymphatic capillaries do?
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they weave through the tissues collecting fluid lost from capillaries.
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Describe a lymphatic capillary
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lymphatic capillaries are blind-ended tubes in which adjacent endothelial cells overlap each other, forming flap like mini valves.
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Returning lymph to the blood, name the 2 drop off sites
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Right side - Lymphatic duct
Left side - Thoracic duct ** larger one |
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Describe the process of returning lymph to the blood via the Right side, Lymphatic duct
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Right lymphatic duct drains fluid from the Right upper limbs & the Right side of the head & thorax, into the Right subclavian vein.
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Describe the process of returning lymph to the blood via the Left side, Thoracic Duct
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the larger Thoracic duct receives fluid from the rest of the body & drains into the left subclavian vein.
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Describe how lymph fluid is moved through lymph vessels.
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Lymph is moved via the same mechanisms that promote venous return.
- milking action of muscles - pressure changes in thorax during breathing - valves prevent backflow |
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What type of muscles does the Lymphatic trunk & thoracic duct have?
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Smooth muscles in their walls
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What are deep lymph vessels bundled with?
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arteries
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List the major types of cells in the lymph system
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Lymphoid Cells
Lymphocytes T & B Dendritic Cells Macrophages Reticular Cells |
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State the function of the T Cell
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- They are the "brains" of the operations
- Involved in cell 2 cell combat - Born in bone marrow |
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State the function of the B Cell
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- Bone marrow
- produce antibodies - involved in chemical warfare - "stun" enemy cells & then macrophages eat / clean up the enemy cell |
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State the function of the Dendrites
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- they are a type of Macrophage cell
- big hairy cells - activate immune system - "wears" enemy cell to warn other cells |
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where are Lymphocytes also found?
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in the blood
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Do red blood cells go through the lymphatic system?
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NO, only white cells
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Describe the basic structure of Lymphoid tissue
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- it houses & provides a proliferation site for lymphocytes
- furnishes an ideal surveillance vantage point for lymphocytes & macrophages |
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What type of loose connective tissue is the Lymphoid tissue made of, except the thymus?
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Reticular connective tissue
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What do Macrophages live on?
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Fibers of reticular network
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Name the MAJOR Lymphoid organs
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- Lymph Nodes
- Spleen - Thymus - Adenoids (MALT) - Tonsils - Peyer's Patches - Appendix |
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What is the function of the Lymph Nodes?
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Where collecting vessels drain into ducts
- Filter : macrophages - Activate immune system : lymphocytes |
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What is the function of the Spleen?
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- Immune surveillance & response
- does NOT filter lymph - Blood cleansing function / stores platelet |
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When is the Thymus most active?
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Most active during youth
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What is the function of the Tonsils?
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Monitors what is going "into" system via the mouth
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What is the function of the Peyer's Patches?
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Distal portion of small intestine, similar function to tonsils, but found in gut
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What is the function of the Appendix?
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Monitors what goes through the large intestine.
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What is the function of the Thymus?
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where T cells mature
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How does the Lymphatic system integrate with other body systems?
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- activates immune system
- maintains blood volume - maintains health of digestive system |
