Lymphatics Flashcards
How does the lymphatic system help with colloid pressure?
Entrains proteins back into the vascular system
What do lymphatic vessels do?
Transport interstitial fluid back into the blood
How does the lymphatic system participate in immune function?
Via lymphocytes
What are lymphatic capillaries?
Closed-end tubules that extend into the intercellular spaces
What are lymphatic vessels?
Vessels that flow through/past lymph nodes
What are the lymphatic collecting ducts?
Lymphatic vessels empty into collecting ducts, which empty into thoracic veins
What is the thickness of lymphatic capillaries?
Single layer epithelial cell
What enters the lymphatic capillary, and what is it now called?
Interstitial fluid
Lymph
How does lymph flow in lymphatic vessels?
Lymphatic vessels have valves
Some intrinsic constriction
Muscle movements massage vessels
Intrinsic vessel constriction of lymphatic vessels creates what kind of pressure?
Negative
What is the purpose of the negative pressure generated by the lymphatic vessels?
Entrain proteins from the interstitial space
Name the 2 lymphatic collecting ducts
The thoracic duct
Right lymphatic duct
Which one of the 2 lymphatic collecting ducts is the major one?
The thoracic duct
Damage to which lymphatic duct is more significant? Why?
Left
It drains a larger portion of the body
Why are right IJs preferred over left IJs?
The lymphatic duct drainage sites empty into the subclavian veins very close to the same place the internal jugulars empty, if damage is done better the right than the left since it drains a larger portion of the body
What general area does the thoracic duct receive lymph from?
Lower extremities Abdomen Left chest Left arm Left head and neck
Where does the thoracic duct empty?
Into the left subclavian vein near the left internal jugular
Where does the right lymphatic duct receive lymph from?
Right arm
Right chest
Right head and neck
Where does the right lymphatic duct drain?
Into the right subclavian near the right internal jugular
What are lymph nodes?
Collections of lymphoid tissue
What is contained in lymph nodes?
Phagocytes macrophages that purify lymph
Where are B and T cells located?
In the lymph nodes
Name the principal lymphoid organ
Thymus
When is the thymus most active?
During infancy
