Lymphatic System
- 3 function and 3 parts
Functions: 1.fluid recovery 2.lipid absorption 3. immunity parts: 1.lymphatic vessels 2.lymph 3.lymph nodes
How many liters of fluid does the lymphatic system return a day
3
Define edema/ lymphedema/ elephantiasis
edema- fluid retained in the IF
lymphedema- localized edema
elephantiasis- extreme
Lipid Absorbtion
fat soluble nutrients are mostly transported by lymphatics to the blood
Lacteals
lymph capillaries in the gut
-contained milky, high fat lymph called chyle
Immunity
as foreign proteins pass through lymph nodes, lymphocytes will be activated, causing a immune response
Lymph
fluid in the lymph vessels
- Low PP, no RBC or platelets
- I.F. enters lymph capillaries to become lymph
Lymphatic vessels
transport lymph
3.0L/ day
lymphoid cells
lymphocytes and macrophages
Lymphoid tissues
collections of lymphocytes and macrophages spread throughout the body
Lymphoid organs
contain a high concentration of lymphocytes; surrounded by a capsule of connective tissue
Lymph capillaries are found everywhere except
teeth, bone, bone marrow, and CNS
Lymphatic capillaries
- closed on one end
- wider
- endothelial cells overlap to form mini-valves
What are lymphatic vessels most like
veins
moves very slow
low pressure
Where are lymphatic vessels located
in the skin they run close to the superficial veins
-deep lymph vessels run next to deep arteries
Lymph Flow
- rhythmic contractions of the big lymph vessels
- contractions of the large blood vessels
- aided by the muscular and respiratory pumps
progression of life
lymph capillaries–>Collecting vessels–> lymphatic trunks–> collecting ducts (thoracic and right lymphatic ducts)
Right Lymphatic duct
.5 inches long
drains vessels from above the diaphragm on the right side
Thoracic Duct
15-18 inches long
drains all vessels below the diaphragm
and above the diaphragm on the left side
Lymphocytes
B cells, T cells, and NK cells
macrophages
derived from monocyte
dendritic cell
found in the skin, mucous membranes and lymphatic organ
Reticular cells
produce a network of fibers called stroma that support other lymphoid cells
