Lymph Ultrastructure Flashcards
What is the lymphatic system?
A series of vessels and nodes that collect and filter excess fluid before returning it to venous circulation
Main sites of lymph tissue
Appendix, red bone marrow, spleen, thymus, tonsils, wall of gastrointestinal tract
Lymph nodes are…
Kidney shaped structures which filter foreign particles from the blood and are mainly in the abdomen
Lymph nodes contain…
B lymphocytes, T lymphocytes and other immune cells
Lymph fluid enters the lymph node through … and exits through …
Enters afferent lymphatic channel and leaves through efferent lymphatic channel
Macrophages in lymph nodes function
Act within the sinuses of the lymph node to filter foreign particles
Superficial lymphatic vessels…
Arise in subcutaneous tissue and accompany venous flow
Deep lymphatic vessels
In deep tissue such as internal organs and accompany arterial flow
Pathway of lymphatic fluid
Lymph channels - lymph vessels - lymph nodes (several) - lymph trunks - lymph ducts - venous circulation
Two lymph ducts
Right lymphatic duct and thoracic duct
Lymph fluid is…
Transudative, transparent and yellow
How much blood volume becomes lymph
10%
Why does lymph fluid leave the capillary bed
Hydrostatic pressure
How much lymph do adults produce a day
3-4 litres
Lymphoma is…
A tumour arising from lymphatic cells
