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What are the two major structural components of the lymphatic system?
- 1. L.V. = Lymphatic Vessels
- 2. L.T.O = Lymphoid tissues and organs
What is the overall function of the Lymphatic system?
To return excess interstial fluid back to the cardivascular system
What is the other major function of the lymphic system?
Also helps body get rid of other foriegn materials
what is the function of the L.C.?
Permits fluid to enter the capillary but prevents lymph from leaving the vessel.
What is the structure of the lymphatic capillaries?
- -Structure of the lymphatic capillaries are permeable
- -An absorb large lipid fragments.
Identify the general distribution patterns of the lymphatic vessels within the body.
The cappillary beds force fluid out of the blood at the arterial ends (upstream) and cause most of the expelled fluid to be reabsorbded at the venous end (downstream)
What is the direction of flow of the lymph within the lymphatic vessels?
Lymph flows only TOWARD the HEART
What 3 factors promote the flow of lymph?
- 1. Contraction of skelton muscles
- 2. Air pressure changing inside and outside the lungs
- 3. Contraction of respiratory muscle during breathing.
What is the destination of the lymph when it passes through the lympahtic vessels?
the right lymphatic duct and the thoracic duct towards the right atrium of the heart
What is the location of a lymph node?
They are clustered along the lymphatic vessels. Also located on the lymph
What is the structure of the Lymph nodes?
Lymph nodes are small and maze like
What is function of the lymph nodes?
- L.N. help protect the body by removing;
- 1. foreign materials
- 2. tumor cells from the lymphatic stream
- and by producing lymphocytes that function in the immune response
What two system are the immune system made up of?
1: Innate defense system or Non specific defense system
2: Adaptive or Specific defense system
What does the innate defense system do?
Responds 1st to protect the body from all substances no mater what it is.
What does the Specific defense system do:
Maps the attack of a particular foriegn substances
What is the CISTERNA chyle?
A cavity that serves as a reservoir for the lymph or other body fluids.
What is lacteal?
They are tiny vessels in the villi of the wall of the small intestine through which chylomicrons are absorbed and released into the lymphatic system.
what is the location, structure, and function of the THYMUS:
- Is found low in the throat overlying the heart.
- The thymus produces thymosin hormones. it also produces T-cells for the immune system.
What is the location, structure, and function of the SPLEEN?
in the left side of the abdominalcavity, just beneath the diaphragm and curls around the anterolateral aspect of the stomach.
- FUNCTION: Most important function is to destroy worn out red blood cells and return some of thier break down products to the liver. it also filters and cleans blood of bacteria, viruses & other debris.
- STRUCTURE: is soft
What is the location, structure, and function of the TONSILS?
STRUCTURE: are small masses
LOCATION: ring the pharynx (in the pharyngeal region)
FUNCTION: to trap and remove any bacteria or other foreign pathogens entering the throat
What is the location, structure, and function of the APPENDIX?
- STRUCTURE: a tube like structure
- FUNCTION: to capture and destroy bacteria
- LOCATION: first part of the large intestine
What is the location, structure, and function of the PAYERS PATCHES?
LOCATION: Found in the walls of the distal part of the small intestine.
FUNCTION: to capture and destroy bacteria (always present in tremendous numbers in the intestine.)