Class notes
Biol 1303 Lymphatic System Notes
- Course
- BIOL 1303
- Institution
- University Of Houston - Downtown
This is a comprehensive and detailed note on the lymphatic system for Biol 1303. Enjoy!!
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Interstitial fluid: About 20 L of fluid filters out of blood capillary walls to form interstitial fluid
Fluid surrounds cells and tissues
Contains less protein than blood plasma (proteins too big to go through capillary walls)
17 L of interstitial fluid is reabsorbed in the venous ends of the capillaries
The remaining 3 L must be returned to cardiovascular system by the lymphatic system
Lymphatic system functions:
Complex drainage system
Interstitial fluid is carried through, empties into the veins and becomes part of
blood plasma
Transports lipids and lipid-soluble vitamins (A,D,E,K) from digestive tract to blood
Lymphatic system slows their entry into blood and allows even dispersion
throughout the body
Contains cells that participate in the immune response
Various types of white blood cells participate in body defense
Lymphatic system components:
Lymph
Lymphatic vessels
Lymphatic tissue structures
Red bone marrow
,Lymphatic vessels:
Begin as lymphatic capillaries
Originate in tissues and carry fluid that forms there
Closed at one end and located between cells
Slightly larger than blood capillaries and permit interstitial fluid to flow into the
vessel, however fluid cannot leave once in vessel
Endothelial cells that compose lymphatic capillary walls overlap like shingles
Lymphatic capillaries unite to form larger lymphatic vessels
Structurally resemble veins
However, walls thinner and more valves than veins
Interstitial fluid entering here is called lymph
Merge to form lymphatic ducts
Lymphatic ducts:
Thoracic duct
Main lymph collecting duct
Receives lymph from several areas
Left side of head, neck, chest
Left upper limb
Entire body under ribs
Right lymphatic duct
Drains lymph from upper right side of body
Lymphoid organs:
Primary lymphatic organs
Sites where stem cells divide and develop into mature T and B cells
Red bone marrow
Thymus
Secondary lymphatic organs and tissues
Most immune responses occur in these areas
Lymph nodes
Spleen
Lymphatic nodules
Lymphatic tissue
Composed of reticular connective tissue containing many lymphocytes
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